BIL (30) has been seeing his partner (28) for about a year and we're concerned she has an alcohol problem. She's one of those people who has what I would call a wine personality. Everything's about getting on the wine and she's constantly sort of bragging about how much she drinks?
Anyway, over the summer she's started meeting extended family and came to a few family gatherings (a milestone birthday, a wedding, charity fundraiser, and a BBQ) where she's drunk 2/3+ bottles of wine to herself, got pretty smashed, and behaved really obnoxiously towards DP's lovely, welcoming family. (For context she doesn't really know the family yet, has only met us all a handful of times). She's also a teacher and this weekend she drunkenly told me she sometimes has a mug of wine in the afternoons in class with her TA.
BIL seems oblivious to it though and seems to think she's just having fun. He told us she has a stressful job and it's how she unwinds, but that's obvs not great. Should we press the fact we're a bit concerned about her? And maybe she needs to reign things in a bit? Or just leave it? I think her parents are big drinkers and are probably oblivious, and seems her mates are mostly a group of her old uni sports team friends, who of course, stereotypically, sound pretty boozy. DP is pretty upset at the way she's spoken to us and his parents, and thinks the girlfriend should at least know it's not really acceptable.