hi, i have a daughter from a previous relationship, he hasnt seen her for 4/5 months, he has seen her today and now wants her to go and spend the night at his new girlfriends house next weekend, im not happy about this at all, the girlfriend is a drinker and they both smoke weed, and this girlfriend is the 3 or 4th since we have split up, how many does she have to get used to before they split up again, i really need to know where i stand? thanks