Kristen; Buddy's Human
Join Date: Jan 2012
Location: San Diego, CA
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See, I'd approach it by phrasing it differently. Since you said your brother was being a twit during their visit, I'd ask him up-front "hey, what's up? Everything ok at work? You were acting really weird when you came home, you totally blew mom off, etc. etc". Give it a chance to open up as a conversation where he can vent to you (that's what siblings are for right?).
If he mentions that his girlfriend is stressing him out, that's when I'd gently mention something about how she seemed a little high-strung (LOL) when she came to visit and then segue into telling him one or two specifics ("well, she was cursing a lot around the family, and she was being awfully hard on you..."). I wouldn't mention more than maybe two or three at most things your family noticed; too much makes it sound like you guys had a laundry list and absolutely hated her. And as others said, I'd definitely have a few compliments on hand as well, so if he said "she's really a great girl" you could respond with "yeah, she seems really smart" or something.
If he doesn't mention her, then at the very least you've pointed out to him that he wasn't acting like himself around his family and you've helped him unload some steam. But I'd definitely make it a phone call!