These kids are probably regularly adultified by this parent refusing to be the adult in the situation and that's why they're so affected by her emotional unpredictability. Maybe I'm projecting a bit because I identify with the kids, but I was stressed to nervous breakdown as a teen and often tried my best to hide from my mother when she was having a stressful time and I remember that hyperalertness to her moods all too well. In fact, I still have trauma responses to some common stress behaviors on the part of other people and often completely shut down in response to raised voices. So yeah, this mom's attitude has me clenching my teeth. Go to therapy, you selfish jerk!