I got into a fight with my sister on Thanksgiving a couple years ago.

It wasn't super dramatic, but it was really awkward and I felt bad for my family, lol. Basically my sister and I weren't on speaking terms because a couple months before, she lost her mind on a 3 hour drive home and wouldn't let me pee until she punched me and tried to abandon me and my mom on the side of the highway and hitchhike a ride home with the car keys in hand. She steadfastly believed she was "in the right" which was completely insane to me. But time had passed, I felt like I could be calm when approaching her, so after T-day dinner I asked if we could talk alone and she agreed.

I wanted things to go back to normal, but I *HAD* to understand how she thought she was in the right here. I remember the sequence of events so clearly and she was acting fucking crazy. So I tell her I want us to tell our sides of the story so I can see where we're diverging. She agrees and goes first, and of course (idk what I was expecting) she lies about everything, says she was driving me to the bathroom, I attacked her, etc etc etc-- things that were verifiably untrue. I felt like spitting fire because watching her lie to my face was infuriating, but I just breathed it down and said "Okay, my turn?" I start to tell her what happened from my perspective and she can't let me get three words out. Literally talks over me, tells me I'm wrong, etc, and then escalates to screaming. It felt like the same detached-from-reality feeling she had when she was going crazy last time so I just left the room.

My older brother ended up putting us both in headlocks and made us agree to chill the fuck out, and we did.

Several years later we have learned that my sister has a mental illness that involves cyclical mental breakdowns (of some kind) and she's an alcoholic who seems to suffer from alcohol-induced psychosis. The weekend of the first huge fight, we drank a lot together to celebrate my mom finishing chemo and being declared cancer free. Every year since then, around this time of year, she's had mental breakdowns that include physical violence after drinking, whether she's drunk at the moment or had been drinking for a couple days before. I have a lot of wild stories about her.