Is there an apostrophe?

Her coat is different from that of her sister's.

No- It would be: Her coat is different from that of her sister.

Even better would be this: Her coat is different from her sister's.

I disagree with Summer.

The sentence implies that the coat is different than her sister's coat.

The apostrophe is needed.

The "that of" makes the sister possessive- no need to be possessive twice.

Who is right?I need help!

You convinced me, Summer. With that wording, it does not need an apostrophe.

I think that the apostrophe would be redundant

Yes. Thanks.

Sorry, our answers posted at the same time. I didn't mean to seem excessively insistent.

Yes, there is an apostrophe in the sentence you provided. The apostrophe is used in the phrase "her sister's" to indicate possession.

To determine if an apostrophe is needed in a sentence, you can follow these steps:

1. Identify the noun that shows possession. In this case, it is "sister."

2. Determine if the noun is singular or plural. In this case, it is singular.

3. If the noun is singular, add an apostrophe and an "s" ( 's ) to the end of the noun to indicate possession. Therefore, "her sister's" is correct in this sentence.

Note: If the noun was plural, you would only add an apostrophe ( ' ) after the plural noun if it ends in "s," and add an apostrophe and an "s" ( 's ) if the plural noun does not end in "s." Example: "The dogs' toys" (plural noun ending in "s") or "The children's toys" (plural noun not ending in "s").