Re: Not an FB user. Can I delete my personal data?
It's his photo and his right to say "that's my nephew".
That's a debatable proposition. It becomes less debatable if he says "that's my nephew Pickled Aardvark" because it turns you into a data subject. What should become a real problem for FB, assuming you're in the EU, is for them not to say "I don't wish to know that, I'll pretend you never said it." unless you gave them permission to hang on to such information about you.