We get a lot of questions about coordinating pronouns with nouns for joint possession, along the lines of "my wife's and my dinner," most recently: "you," "your" or "yours" in this sentence? Many of these are closed as duplicates of the following question, which superficially seems to be about this issue: "My wife and I's seafood collaboration dinner".
However, in fact this question is more specific and not suited to being a canonical answer to the general question. One of its answers addresses the general issue, and received the following comment (bolding added by me):
This answer misses the point. The handy rule you've been taught — we've all been taught that handy rule. We all know that "my wife's and my" is Standard English; we all know that a stanalone "I's" is not; but this question is about neither. It's about a peculiar construction produced by a native speaker (who himself is well aware that it's non-standard) and an attempt by another native speaker at an explanation of why it was possible for it to be produced in the first place. This question is all about putting that explanation to test, and the top and accepted answer adequately does just that.
I agree with this evaluation of the question (I disagree with the idea that "we all know that 'my wife's and my' is Standard English," taken literally, since to many people this doesn't seem to be obvious). Because of this, I feel that the top answer here is not really a very good fit to all the other questions closed as duplicates of this one (there are 2 pages worth of questions linked to this one). A lot of this answer is devoted to explaining why the non-standard form makes sense; in contrast, many of the linked questions are about what the standard form is.
It seems to me that a much more straightforward canonical question is the following: What possessive forms are used for mutual 1st person ownership?
Perhaps it could be edited to remove the reference to 1st person in particular, since the issue is the same (as far as I know) for pronouns in other persons as well.
To clarify, I'm envisioning something similar to what Mari-Lou A proposed for this set of questions. Please respond to tell me what you think, and if I've presented my thoughts clearly.
Another important issue is the matter of identifying the most suitable answers to this general question; currently there are many answers spread out across the multitude of questions.
Possible canonical answers I've been looking at:
