Learn English – apostrophe that goes with a noun which precedes a relative clause

apostrophenoun-phrasespossessives

Suppose you wanted to place a possessive apostrophe in this sentence:
Billy, who goes to my school, favorite game is tag.

I know it's not standard, but I can hear kids (or older) saying an s sound after "school" to make the possession clear.
So I'd like to know if this could be written in the way that it's spoken (albeit not spoken in standard English).

Obviously, the sentence could be reworded, but that's not what I'm after.

Best Answer

I can confirm that in spoken word the sound of 's comes after the phrase. I don't have any authority on this area of English but I would probably write the sentence as "Billy (who goes to my school)'s favorite game is tag."

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