Sisters or Sister’s: Which Is Correct?
Sisters or Sister’s: Which Is Correct?
Have you ever wondered whether to write “sisters” or “sister’s”? These two forms look very similar, but they have different meanings and grammatical functions. Choosing the correct form depends on whether you are talking about more than one sister or showing possession.
The word “sisters” is the plural form of “sister.” It means two or more sisters.
The word “sister’s” is the singular possessive form. It means that something belongs to or is associated with one sister.
For example:
- My sisters live in different cities.
- My sister’s car is parked outside.
In the first sentence, “sisters” means more than one sister. In the second sentence, “sister’s” shows that the car belongs to one sister.
Understanding this small difference can help you avoid common apostrophe mistakes in emails, school assignments, social media posts, articles, and professional writing.
Sisters or Sister’s: The Correct Answer
Both “sisters” and “sister’s” are grammatically correct, but they are used for different purposes.
Sisters
“Sisters” is the plural form of the noun “sister.” It refers to two or more female siblings.
For example:
- I have two sisters.
- My sisters are coming to visit.
- Her sisters live nearby.
- The sisters went shopping together.
There is no apostrophe in “sisters” when you simply mean more than one sister.
Sister’s
“Sister’s” is the singular possessive form of “sister.” It shows that something belongs to, relates to, or is associated with one sister.
For example:
- My sister’s phone is ringing.
- I borrowed my sister’s jacket.
- My sister’s birthday is tomorrow.
- Her sister’s house is beautiful.
The apostrophe comes before the “s” because the possession belongs to one sister.
Quick rule:
Sisters = more than one sister.
Sister’s = belonging to one sister.
What Does Sisters Mean?
“Sisters” is simply the plural form of “sister.”
A singular noun refers to one person:
- My sister is a doctor.
A plural noun refers to more than one person:
- My sisters are doctors.
When forming the plural of “sister,” simply add -s:
sister → sisters
No apostrophe is needed.
Examples:
- Three sisters
- Two sisters
- My sisters
- Her sisters
- The sisters
For example:
My sisters are coming over tonight.
This sentence tells us that more than one sister is coming. It does not indicate possession, so there is no reason to use an apostrophe.
What Does Sister’s Mean?
“Sister’s” is the possessive form of the singular noun “sister.”
The apostrophe shows that something belongs to or is connected with one sister.
Examples:
- My sister’s car is new.
- My sister’s room is upstairs.
- I borrowed my sister’s laptop.
- Her sister’s wedding is next month.
- That is my sister’s book.
In each sentence, the noun following “sister’s” is associated with one sister.
For example:
My sister’s car
means:
The car belonging to my sister.
The apostrophe is important because it changes the meaning of the word.
Sisters vs. Sister’s: Key Difference
The easiest way to understand the difference is to look at whether you are talking about number or possession.
| Form | Meaning | Example |
|---|---|---|
| Sister | One female sibling | My sister is here. |
| Sisters | More than one female sibling | My sisters are here. |
| Sister’s | Something belonging to one sister | My sister’s car is outside. |
| Sisters’ | Something belonging to multiple sisters | My sisters’ house is large. |
This table highlights an important point: “sisters’” is also possible.
“Sisters’” is the plural possessive form. It means something belongs to two or more sisters.
For example:
- My sisters’ house
- The sisters’ room
- My sisters’ children
Notice the apostrophe comes after the s in “sisters’” because the noun is already plural.
Sisters vs. Sister’s vs. Sisters’: Examples
Understanding all three forms makes apostrophe rules much easier.
Sisters
Use “sisters” when talking about two or more sisters.
Examples:
- My sisters live in California.
- The sisters went to the mall.
- I have three sisters.
- Her sisters are very friendly.
- The sisters enjoy spending time together.
Sister’s
Use “sister’s” when something belongs to one sister.
Examples:
- My sister’s car is blue.
- I borrowed my sister’s dress.
- Her sister’s birthday is today.
- My sister’s phone is on the table.
- I visited my sister’s apartment.
Sisters’
Use “sisters’” when something belongs to multiple sisters.
Examples:
- My sisters’ house is beautiful.
- The sisters’ parents were waiting outside.
- I visited my sisters’ apartment.
- The sisters’ decision surprised everyone.
- My sisters’ children are very young.
The key difference is the location of the apostrophe.
One sister owns something → sister’s
Multiple sisters own something → sisters’
Common Mistakes With Sisters and Sister’s
Apostrophes are one of the most common sources of confusion in English grammar.
Mistake 1: Using Sister’s for a Plural
Incorrect:
I have two sister’s.
Correct:
I have two sisters.
Because the sentence refers to two people, you need the plural form “sisters,” without an apostrophe.
Mistake 2: Leaving Out the Apostrophe for Possession
Incorrect:
My sisters car is outside.
Correct:
My sister’s car is outside.
The sentence refers to one sister’s car, so the singular possessive form requires an apostrophe.
Mistake 3: Using Sister’s for Multiple Owners
Incorrect:
My sister’s house is shared by both sisters.
If the house belongs to both sisters, the appropriate form is:
My sisters’ house is shared by both sisters.
The apostrophe goes after the “s” because “sisters” is plural.
How to Remember the Apostrophe Rule
A simple trick can help you remember these forms.
First, ask:
How many sisters are there?
If there is only one sister and something belongs to her:
sister’s
Example:
“My sister’s phone.”
If there are two or more sisters and you are simply talking about them:
sisters
Example:
“My sisters are here.”
If there are two or more sisters and something belongs to them:
sisters’
Example:
“My sisters’ car.”
This gives you three simple patterns:
One sister → sister
More than one → sisters
One owner → sister’s
More than one owner → sisters’
10 Correct Sentence Examples
Here are some examples to make the difference even clearer.
- I have two sisters.
- My sister’s name is Emily.
- My sisters live in different states.
- I borrowed my sister’s car.
- My sisters’ children are visiting this weekend.
- Her sister’s wedding is in June.
- The sisters went to the restaurant together.
- My sister’s favorite color is blue.
- The sisters’ parents arrived early.
- My sisters are planning a family vacation.
Pay attention to the apostrophe in each sentence. It appears only when possession needs to be shown.
Is Sister’s Always Possessive?
No. An apostrophe can also appear in contractions, but “sister’s” specifically is normally understood as the possessive form of “sister” when used as a standalone noun.
For example:
My sister’s car is new.
Here, “sister’s” means the car belongs to my sister.
The word “sister” itself does not need an apostrophe simply because it is being used in a sentence.
For example:
My sister is here.
There is no possession, so no apostrophe is needed.
Frequently Asked Questions
1. Is it sisters or sister’s?
Both can be correct, but they have different meanings. “Sisters” is the plural form, while “sister’s” is the singular possessive form.
2. Is “sisters” plural?
Yes. “Sisters” means more than one sister.
3. When should I use sister’s?
Use “sister’s” when something belongs to or is associated with one sister.
Example: “My sister’s phone is broken.”
4. What is the difference between sisters’ and sister’s?
“Sister’s” indicates possession by one sister. “Sisters’” indicates possession by multiple sisters.
5. Is “my sister’s” correct?
Yes, when you are referring to something belonging to one sister.
Example: “That is my sister’s car.”
6. Is “my sisters” correct without an apostrophe?
Yes. Use “my sisters” when simply referring to two or more sisters.
Example: “My sisters live nearby.”
7. Is “sister’s” the plural of sister?
No. The plural is “sisters.” The apostrophe in “sister’s” indicates singular possession.
Final Thoughts
The difference between “sisters” and “sister’s” is simple once you understand the role of the apostrophe.
Use “sisters” when referring to two or more sisters:
“I have three sisters.”
Use “sister’s” when something belongs to one sister:
“My sister’s car is outside.”
And remember that “sisters’” is used when something belongs to multiple sisters:
“My sisters’ house is beautiful.”
The easiest rule to remember is:
Sisters = more than one sister.
Sister’s = belonging to one sister.
Sisters’ = belonging to multiple sisters.
Once you understand whether you are expressing a plural or possession, choosing the correct form becomes much easier.
