Which of the following sentences contains the grammatically correct bolded section:
"He affected me and my friend's day." or "He affected my and my friend's day."
It seems clear to me that the first sentence clearly sounds the best, but I was always told that you should be able to isolate the sentence to just one of the objects, i.e. remove my friend from the sentence, and when I do that, only the second sentence makes sense.
What is the correct grammar to use here?