Every family has its own culture, and in some families introducing a girl you hardly know to everybody in the family is no big deal. So, pls bear this in mind before concluding that you're special to him because you've met his father and brothers. I'm sure your new guy's close family members have met each and every girl he's ever dated, regardless of the duration of their relationship. And some guys will tell a girl that they've spoken to their mom about her just to get the girl to think that they are serious - in fact, it's the number one reason any guy will tell this to a girl (because I don't see why tell her about your discussion with your mother unless you want to manipulate her thinking). The best way to know if a guy is serious about you is to go with his ACTIONS, not his words. Words are cheap, and they mean nothing if they can't be backed up with action. Meeting family members also means nothing, esp for this guy since you met his family members the second time you saw him.