Would this be weird to do as a big sister

My brother is over for the weekend and tomorrow he's going to see his boyfriend for a few hours. He's 16. My parents don't know because they are extremely homophobic and my dad is homophobic to the point he doesn't mind assaulting gay people. He does it to his own brother who is bi. They are also extremely religious and don't believe in talking about sex. I'm not saying my little bro is having sex, but I was thinking about giving him some condoms and giving him a small talk. Should I or would that be too weird?