Turns out the girl I"m seeing"s brother is a complete tool. I"d met him once prior, and figured he"s just arrogant because he"s young and it turns out it"s much worse than that. He"s a dyed in the wool asshole.
tl;dr: Sister and brother have a deeply dysfunctional relationship and need to be kept apart as much as possible. Fucked up my holiday.
To preface, he did sorta walk in on us having sex on the 4th. Or at least, knocked on the door and interrupted us. I can definitely understand being a little touchy finding some dude plowing your sister on the couch, but this is the same kid that was hitting on a friend of mine a few weeks prior by talking about how much she really wants to see his dick and just doesn"t know it. He"s no cherub, in other words, and they both know the other is sexually active. This isn"t high school, and we"re all adults. He"s also got pretty much zero protective feeling towards his sister, so that wasn"t really a factor in what happened other than backstory for why my girlfriend was already really touchy.
Anyway, girlfriend is already embarrassed and on edge, and the two of them get into a little sibling squabble while he"s standing around with his buddy just being in the way. He was supposed to be at the lake with family, which is actually why we were at her parents" house in the first place to take care of the dog because the brother wouldn"t be there to do it. Apparently he bailed on that and stuck us with the dog because... well, fuck it, I guess just because he could. She"s mad at him for screwing up her 4th by sticking her with dog-sitting for no reason, and tells him so.
Their little squabble goes back and forth in the usual manner of such bullshit, when all of a sudden he slaps her. Not Sean Connery, get hold of yourself woman hard... but hard enough to make a loud pop. I was stunned. Youneverhit your sister in my family, or any woman for any reason. She whirls a spatula at him, he grab it and does the same, and icing for the cake we were making goes all over the place before they finally calm down. It was over in a matter of seconds, but I was still reeling from watching him pop her in the cheek.
He goes outside, and we pack up to go as well. When we get outside, he"s sitting in the driveway in his jeep repeating how he loves her followed by what a bitch she"s being, and how he"ll let her apologize later. We just got in the car and left.
She apologized for the whole thing several times over the day, and was pretty upset that I saw the dynamic between the two of them. We talked it over, and apparently this sort of thing has been going on for years. Apparently growing up her parents were extremely strict on her (thus the anxiety/eating disorder), and when she ended up having medical issues as a result they did a total 180 and have given the brother absolutely no structure whatsoever. He just does what he wants, when he wants, to whomever he wants, and he"s pretty much bullied his sister ever since. It very nearly ruined our whole holiday just because being around him puts her into a funk.
I"m still angry with myself for just standing there in shock. There"s nothing I could have done about it. The guy is a lot bigger than me by himself and he had his friend there watching the whole time as well, but I still kinda hate myself for not being able to stop it. It was over with before I really even knew what was going on, but it"s been bugging me for two days now.
So yeah, something had to come up to shatter the illusion that everything was perfect with this girl. It"s at least not something between the two of us, but it"s got me freaked out a little.