Son's cohabiting girlfriend
My son has lived with his girlfriend for almost 9 months now. They live 3-4 hours away from us. We have met her and we think she is very sweet. Friends warn me "Don't get too close to your children's boy/girlfriend because they may one day break up". I'm new to this since he is our oldest child. Do I invite her for holidays and treat the couple as I would if they were married? As far as I know, there has not been talk of marriage.