Families are for life.....that is, you only get one mom, one dad, and one set of siblings (aside of steps and such, but the bonds there are only thru marriage). Chances are this guy isn't the guy you'll be with for life. AND, if you want to be a part of both of their lives, I'd find a boyfriend who gets along with your family. I think that a lot of people ignore the family factor when they get married, but I would never marry into a family that hated me. I'd respectfully turn the guy down knowing I CAN'T deal with that drama for life.