Ok, this is my humble opinion, but if your Mom would be really offended by this, then i would say take it out of the house.
She feeds you, shelters you loves you, but maybe this would hurt her or really disrespect her. You know your Mom best and she deserves your respect.
Your brother just sounds ignorant, but there again, you dont want to bring discord into your Mom's house.
Good time I guess to master quiet meditation perhaps? Or getting back to nature outdoors?
You know your situation best.
I hope it works out well for you!