Ask the ‘brother’ to move to the moon-I hear he won’t come across any issues there.
In my humble opinion this dude has issues. I don’t have a dad but I hug my mamu who is my father figure. I don’t have nephews, but my husband is my mums nephew and on Eids and so on you see khalas kissing their nephews/nieces on the cheek/forehead etc (my mums quite sussed up on Islamic rules too and says greeting nephews/nieces isn’t Islamically wrong-just what I thought).
I’m not looking for a thread war but I seriously dislike it when certain people wish to rewrite Islamic rules. Mehrams and none-Mehrams two completely different set of people who should be treated differently. If a daughter wishes to hug her dad it’s allowed in Islam right? And if an aunt shakes hands with her nephew where is the fault in that.
How does he greet his mum/sisters/nieces?
As I said, a move to the moon maybe his best option he shouldn’t have any issues up there.