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We can say:

She's a friend of mine.

She's a friend of Tom's.

She's a friend of my parents'.

But today I saw this: She's a friend of Jane and Tom.

Is it correct? Or should it be: She's a friend of Jane and Tom's?

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up vote 3 down vote accepted

The grammatical form of the sentence you indicate is certainly

She is a friend of Jane and Tom's.

meaning that they both know her and are her friends. However, particularly when speaking, the final "s" happens to be overlooked.

With reference to Jay's answer, the option She's a friend of Jane's and Tom's indicates that they are both friends to this girl/woman, but they do not necessarily know each other.

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"She's a friend of Jane and Tom" is correct. The "of" applies to "Jane and Tom" as a compound.

You could also say, "She's Jane's and Tom's friend."

People sometimes say, "She's a friend of Jane's and Tom's." But this is redundant: The "of" already indicates possession; you don't need to also use the "'s".

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But you do say "a friend of mine" instead of "a friend of me". That is what makes English fun. – JeffSahol May 21 '12 at 14:41
What about the last one: She's a friend of Jane and Tom's? – user20934 May 21 '12 at 14:59
@rudra Sorry, what I was trying to say was: No. That's not only redundant but also inconsistent. Say either, "She's a friend of Jane and Tom", or "She's Jane's and Tom's friend". Don't mix the "of" and the "'s". – Jay May 21 '12 at 21:06
@JeffSahol Interesting point. Note that "mine" and "yours" are special cases. The normal possessive of "me" is "my". You can say, "She's my friend", but you wouldn't say, "She's a friend of my". – Jay May 21 '12 at 21:12

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