Quick Answer
Their is the correct spelling. Thier is a common spelling mistake and is not the standard form of the word. Use their to show that something belongs to or is connected with someone or a group.
Thier or their is a common spelling question because the two words contain the same letters in a different order. When typing quickly, it is easy to put the i before the e and accidentally write thier. However, there is a simple answer: their is the correct spelling.
The word their shows possession or connection. You can use it when something belongs to several people, a group, or, in modern English, one person when the person’s gender is unknown or not relevant. For example, “The students finished their homework” and “Someone left their phone here” are both correct.
Is Thier or Their Correct?
The correct spelling is their.
Thier is not the standard spelling of this word. It usually appears when the letters e and i are accidentally switched.
Compare:
- Their house is near the park. Correct
- Thier house is near the park. Incorrect
The difference is only one letter position, but it matters in written English.
If you are trying to show that something belongs to someone or a group, use their.
What Does Their Mean?
Their is used to show possession, connection, or association.
In simple terms, it often means:
belonging to them
For example:
- The children packed their bags.
- The players changed their uniforms.
- The neighbors painted their house.
- The company updated their website.
- The students opened their books.
In each sentence, their connects a person or group with something related to them.
The word does not always mean literal ownership. It can also show a relationship.
For example:
The students thanked their teacher.
The students do not own the teacher. Their simply shows the connection between the students and the teacher.
Why Is Thier Incorrect?
Thier is usually created by reversing the middle letters in their.
Correct:
T H E I R
Incorrect:
T H I E R
Both versions look very similar, which makes the mistake easy to make.
The problem is that thier does not serve as the standard spelling of the possessive word. When you mean something belongs to or relates to them, write their.
Their as a Possessive Word
Their is commonly described as a possessive determiner.
It normally comes before a noun.
For example:
- their car
- their house
- their dog
- their parents
- their idea
- their business
- their plans
- their children
Notice the pattern:
their + noun
Examples:
Their car is outside.
Their plans changed.
Their dog is sleeping.
Their idea worked.
This pattern makes the word easy to recognize.
Their Can Show More Than Ownership
Many learners think their only means ownership, but it can show a wider connection.
Consider:
The students thanked their teacher.
Here, their does not mean the teacher belongs to the students. It identifies the teacher as someone connected with the students.
Another example:
The team celebrated their victory.
The victory is associated with the team.
You can also say:
The company changed their policy.
Here, their connects the policy with the company.
So, a better way to understand their is:
something belonging to, connected with, or associated with them.
Their for More Than One Person
The most familiar use of their is with a plural subject.
For example:
The boys finished their homework.
The word their refers to the boys.
Another example:
Sarah and Mike brought their children.
Here, their refers to Sarah and Mike.
More examples:
- The employees submitted their reports.
- The players entered their locker room.
- The parents picked up their children.
- The neighbors cleaned their yards.
- The students completed their assignments.
In all these sentences, their refers to more than one person.
Singular Their
Modern English also uses their for one person when the person’s gender is unknown, unspecified, or not important to the sentence. It can also refer to a specific person who uses they pronouns.
For example:
Someone left their jacket on the chair.
We do not know who left the jacket, so their works naturally.
Another example:
Every student should bring their own notebook.
Here, their refers to each student without specifying gender.
You may also see:
If a customer has a question, they can contact their representative.
This use is now common in many forms of English.
Their vs There
Their and there sound alike, but they have different meanings.
Their
Their shows possession or connection.
Their house is beautiful.
There
There can refer to a place.
The house is over there.
It can also appear in sentences that introduce the existence of something:
There is a problem.
A simple memory trick is:
Their = belonging
There = place or existence
This distinction is one of the most common spelling points in English.
Their vs They’re
Another common confusion is their and they’re.
Their
Shows possession or connection.
Their car is new.
They’re
Short for they are.
They’re waiting outside.
Try expanding they’re:
They’re happy.
becomes:
They are happy.
That works.
But:
Their happy.
does not work.
A useful test is to replace they’re with they are. If the sentence still makes sense, they’re is probably the word you need.
If you are showing possession, use their.
Their vs Theirs
Their and theirs are related, but they do not work in exactly the same position.
Use their before a noun:
That is their car.
Use theirs when the noun does not follow directly:
That car is theirs.
Compare:
- This is their house.
- This house is theirs.
- Those are their books.
- Those books are theirs.
Do not write:
This is theirs house.
Instead, write:
This is their house.
Common Mistakes With Thier
The most obvious mistake is writing thier instead of their.
Incorrect:
The students forgot thier books.
Correct:
The students forgot their books.
Another example:
Incorrect:
They took thier dog outside.
Correct:
They took their dog outside.
The mistake can happen in casual typing, school assignments, emails, social posts, and professional documents.
Because thier looks so close to their, writers sometimes fail to notice it during proofreading.
Common Mistakes With Their, There, and They’re
The spelling problem becomes more confusing because their, there, and they’re sound alike in normal speech.
Look at these examples:
Their car is blue.
Their shows possession.
The car is over there.
There refers to a place.
They’re driving home.
They’re means they are.
Here is another useful example:
They’re taking their bags over there.
Break it down:
- They’re = they are
- their = belonging to them
- there = a place
Once you separate their meanings, these three words become much easier to use.
Why Do People Spell Their as Thier?
The main reason is that the letters are easy to reverse.
The correct spelling is:
their
But a writer may remember the letters as:
thier
This is especially common when typing quickly.
Another source of confusion is the familiar spelling rule often taught as “i before e.” That rule has many exceptions, so it should not be treated as a perfect rule for every English word.
For their, simply remember the correct letter order:
T H E I R
Easy Ways to Remember Their
A simple memory method is to break the word into two parts:
the + ir
This gives you:
their
Another useful method is to connect their with possession.
Think:
their house
their car
their idea
their choice
If you mean something belongs to them, think their.
You can also compare it with:
our house
our car
our idea
If our would make sense in the sentence, their may be the correct choice when referring to them.
Their in Everyday Sentences
Here are some natural examples:
- Their dog is sleeping.
- Their house has a large backyard.
- The children cleaned their room.
- The players packed their bags.
- The employees finished their work.
- The family changed their plans.
- The neighbors sold their house.
- The students opened their laptops.
- The customers received their orders.
- The musicians tuned their instruments.
Each example uses their before a noun.
Their in Professional Writing
Their is completely normal in professional writing.
For example:
Employees should review their benefits before making a decision.
Another example:
Customers can check their order status online.
You can also use it in business communication:
The team shared their recommendations.
The managers discussed their plans.
Each department submitted their report.
There is no need to replace their with a more complicated expression. It is a standard and useful English word.
Their in Academic Writing
The word their is also common in academic writing.
Examples:
Students should support their arguments with evidence.
Researchers compared their findings with earlier studies.
Participants provided their responses anonymously.
Readers can form their own conclusions.
Singular their can also be useful when a sentence refers to an unspecified person:
A student should check their work before submitting it.
This avoids choosing a gender when the sentence does not provide one.
Their With Animals and Groups
Their does not only refer to people.
It can also refer to animals, organizations, teams, and groups.
Examples:
The dogs returned to their owner.
The birds built their nest.
The company changed their logo.
The team celebrated their win.
The committee announced their decision.
The exact grammar can depend on the type of noun and the style being used, but the basic idea remains the same: their identifies a connection with the group or subject.
Thier or Their in Text Messages
Fast typing can lead to thier appearing in text messages.
For example:
I think thier house is nearby.
The intended word is clearly their.
Correct:
I think their house is nearby.
Even though people may understand the typo, using the correct spelling is better when you want your writing to look polished.
This matters even more in school assignments, applications, work messages, and formal communication.
Thier or Their on Social Media
Social media posts often contain spelling mistakes because people type quickly.
You may see:
I love thier new album.
The correct version is:
I love their new album.
The mistake does not change the intended meaning, but thier is still not the standard spelling.
A quick proofreading check can catch this type of error.
Practice Questions
Choose the correct word in each sentence.
Question 1
The students brought ___ books to class.
Answer: their
The books belong to the students.
Question 2
Someone left ___ umbrella at the door.
Answer: their
The person is not identified, so singular their works naturally.
Question 3
The players celebrated ___ victory.
Answer: their
The victory is associated with the players.
Question 4
They took ___ dog to the park.
Answer: their
The dog belongs to or is associated with them.
Question 5
The employees finished ___ reports.
Answer: their
The reports are connected with the employees.
Fill in the Blank
Try these without looking at the answers first.
1. The children put ___ toys away.
2. The team changed ___ strategy.
3. Someone forgot ___ keys.
4. The neighbors sold ___ house.
5. The students opened ___ laptops.
Answers
1. their
2. their
3. their
4. their
5. their
Every sentence needs the possessive word their.
A Simple Comparison
| Word | Meaning | Example |
|---|---|---|
| Their | Belonging to or connected with them | Their car is outside. |
| Thier | Incorrect spelling | Do not write thier car. |
| There | A place or existence | The car is over there. |
| They’re | Short for they are | They’re outside. |
| Theirs | Something belonging to them | The car is theirs. |
Learning these words together can prevent several common mistakes.
Quick Grammar Test
When you are unsure about their, try replacing it with our.
For example:
They parked their car outside.
Change it:
We parked our car outside.
The sentence still works.
Another example:
The students finished their project.
Change it:
We finished our project.
Again, the structure works.
This is a useful quick check when you are writing.
What Should You Write?
If you are choosing between:
thier
and
their
choose:
their
Always use their when you mean something belongs to, relates to, or is associated with them.
For example:
Correct:
They forgot their tickets.
Incorrect:
They forgot thier tickets.
Correct:
The children packed their bags.
Incorrect:
The children packed thier bags.
The rule is simple, even though the spelling mistake is common.
Final Tips
Remember these points:
- Their is the correct spelling.
- Thier is a common misspelling.
- Their usually comes before a noun.
- It shows possession, connection, or association.
- Their can refer to several people.
- Their can also refer to one person when appropriate.
- There is different from their.
- They’re means they are.
- Theirs can stand alone without a noun after it.
- The correct spelling is T H E I R.
FAQs
Is thier or their correct?
Their is correct. Thier is a spelling mistake. Use their when you want to show that something belongs to or is connected with someone or a group.
What does their mean?
Their is a possessive word that shows something belongs to, relates to, or is associated with them. For example, “They brought their bags.”
Why do people spell their as thier?
The mistake usually happens because the letters e and i are accidentally switched. The two spellings look very similar, so the error can happen easily when someone is typing quickly.
What is the difference between their and they’re?
Their shows possession or connection, as in “their house.” They’re is short for “they are,” as in “they’re waiting outside.”
What is the difference between their and there?
Their shows possession or connection, while there commonly refers to a place or introduces the existence of something. For example, “Their car is there.”
Conclusion
The correct spelling is their, not thier. The word their is used to show that something belongs to, relates to, or is connected with someone or a group. It normally appears before a noun, as in their house, their plans, or their friends.
The easiest way to avoid the mistake is to remember the letters in order: T H E I R. Also keep their, there, and they’re separate in your mind because they sound alike but have different jobs. Once you learn these small differences, choosing the right word becomes much easier.
