Sorry, Susan......my mind is going along the lines of pop - pawn - uncle
but then wouldn't it be "cousin" rather than "nephew"?
No, I can't solve it, I'm afraid!
i think Elle is spot on.
your nephews father is your uncle.
uncle is a synonym for pawnbroker.
to 'pop' something is to pawn it (like in the song 'pop goes the weasel').
Your nephew's father is either your brother or brother-in-law or sister's partner depending on sibling blood relationship and if your blood sister is married.