"He is a friend of Tom and mine" "He is my and Tom's friend"

Question

I have read all the related Q&A I could find on here, but there didn't seem to be one that answers my question exactly. There was one question that was related, but I don't think this would be a duplicate, so here goes nothing:

This is Brian. He is a friend of mine and Tom's (or: he is a friend of Tom's and mine/he is a friend of Tom and mine)

I got stuck writing this line because "a friend of Tom's and mine" sounds best to my ear but I don't trust my ear. Are the other options correct?

This is Brian. He is Tom's and my friend. (or: he is my and Tom's friend/he is Tom and my friend)

With this sentence, "he is Tom's and my friend" and "he is my and Tom's friend" sound fine, but I am not entirely sure either.

Can you add the links to at least two questions that you consulted? — Mari-Lou A, Jan 20 '23 at 09:34
@Mari-LouA That one only considers oblique genitives, this one is considers the oblique genitive as well as both the s-genitive and the normal of-genitive. — Araucaria - Him, Jan 20 '23 at 10:19
There are several 'Related' question on the right here. I suggest "He is Tom's friend and mine." — Weather Vane, Jan 20 '23 at 10:51
Does this answer your question? "My wife and I's seafood collaboration dinner" Also My and Linda's or Mine and Linda's?, among others. — FumbleFingers, Jan 20 '23 at 11:35
@FumbleFingers Those aren't obliques genitives! [oblique genitive = the X of Y's, as opposed to Y's X or the X of Y] — Araucaria - Him, Jan 20 '23 at 15:34
@Mari-LouA Seen it and that's the one I said was related. If you have read my question carefully I don't believe you could say it's a duplicate. Does the answer there address this: "He is Tom's and my friend"? — desmo, Jan 20 '23 at 16:32
"There was one question that was related," but with no link and no question title. In any case, I put the link up in the comments :) — Mari-Lou A, Jan 20 '23 at 19:13
@Araucaria-Nothereanymore. how is one of the possible solutions presented by the OP: Z is a friend of X's and mine different from this post? — Mari-Lou A, Jan 20 '23 at 19:21
@Mari-LouA It isn't, but it's only one of the suggestions they are weighing up. — Araucaria - Him, Jan 21 '23 at 00:13

"He is a friend of Tom and mine" "He is my and Tom's friend"

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