<human>: Condense the text into a few key points

Original post: 

So things have been pretty decently quiet since the rules were set up, mainly because I'm either at work or with my boyfriend/friends. Which is nice, I see her for like 10 minutes a day, we stay civil. Everyone's happy.

Until today, where she got mad because my dad said "I'm picking (my sister) up" instead of "I'm picking (my sister) up from school". This led to a huge argument to which culminated in my mom threatening to stab herself or my dad so she could make sure he got the point. 

I came home from baby sitting to talk with my mom, and explained to her that saying things like that was unacceptable and asked if it was a cry for help, if she was depressed, ect. She said no, and while I believe her, I'm keeping one eye on her at all times. 

Things have gotten pretty dicey and the little sister is broken up. I made it clear to both parents they can't put on this kind of show for my sister any longer. It seemed to sink through with my mom, surprisingly my dad wasn't ok with it?
<bot>: my mom threatened to stab herself and my dad over a grammatical issue. Stood up for my little sister and now my dad is pissed?