In the following example, which is correct?
My grandson posted a video of a game he was playing while it was in progress. The question was asked, "Are these videos of your game play or someone else's?"
My grandson answered the question with, "That would be I."
Was that the correct way to answer...or, should the answer have been, "That would be "me."?
I'm so old and forgetful, that now both answers look incorrect to me!

Hi Lynn

The traditional rule is that only the nominative (I, we etc.) is grammatically correct where the pronoun is predicative complement of "be", as it is in your example. But that is to confuse correctness with formality. The accusative (me, us etc.) is perfectly grammatical and acceptable, though less formal than the nominative.

PaulM