Can't, thank God, really compare to any of the family shit. Parents are some stuck up snobs, have a few aunts that would get beyond fucked up drunk at family functions (had an aunt that would show up with a 7-11 Big Gulp FULL of vodka, no chaser whatsoever, kill it in a 4 hour period, and you'd never know).
Girlfriends, on the other hand, I've dealt with some fucked up shit. Worked with a girl I was dating, I was in charge of reviewing tech support calls, so basically just listened to recordings all day and wrote up reviews. Listened to her on a personal call to a friend back east saying about guilty she felt about cheating on me non-stop for the last 6 months and that she didn't know what to do. Ripped the audio to a CD and when we got home threw it in the player and cranked the volume. She fell apart, grabbed something out the liquor cabinet and probably killed a fifth in 2 quick moves. She spent the whole night in a drunken stupor trying to fuck me, crying the whole time, saying she would be my slave, would never leave my side, would print out her phone records for me monthly, would never leave the house without me, the works. Told her no sane person would want that kind of relationship and we cut all ties within a few days.
Interesting add-on to that story, one of the guys she was fucking around with worked with us and they started dating soon after, so I had to see that shit daily. He knocked her up and they got married, then within 2 months he told her met someone else, filed for divorce, and bounced. Karma is a bitch.
Also dated a girl that was flawless when we were alone, just the perfect girlfriend. Like hanging out with the best friend you could ever hope for AND amazing crazy sex on tap. However around others, she became the most distant, cold person you'll ever meet. Hated physical contact, no loving affection, jack shit. First time I met her friends I basically met ALL of them at once, big house party. As we were pulling up to the house she flat out told me "Don't tell people we're dating please, go see if you can meet new people, I'll see you when we leave". Then she went around bullshitting with her friends, life of the party, but would not make eye contact with me or acknowledge me in the least. I actually bumped into her accidentally at one point, she looked me dead in the eyes and went "Excuse me, sir" and kept walking. Her closes friends had to be in on it and you just knew they didn't approve as all night they were chatting me up, "need another drink?", that kind of stuff.
I was crazy into this girl and that whole night just fucking destroyed me. We got back to her place and it was bi-polar city, she was back to crazy in love, what do I want for dinner, she'll make anything I want, any movies I want to watch, just baffling shit. Months later she eventually realized what she was doing, apologized like mad, she had no excuse, etc. It got normal from then on, but that early shit was nuts.
Fuck, after writing that my shit seems pretty tame in this thread.