Be an encouraging father figure to him and advise him to go to college and live there. The mom will love you for that, and you two will have lots and lots of quality time together.
Hell no I'd be a terrible father and I sure as hell ain't raising no other n!gga's kids even if he is dead. Besides she doesn't give a f*ck about that stuff. As long as I keep cracking funny jokes and find a way for her to see my dick I'll be in there easily.