The whole A family has serious mental health issues. That's what caused their dysfunction. And it's also why I can't hate them the way most people do.
They need professional help. They should have gotten it a loooong time ago, but like many other families, they didn't, until it was too late.
This case is part of the reason I sought early intervention for my DD's mental health problems.
JMO
Most counseling practices require that their therapists receive regular therapy themselves, understanding how easy it is to allow something small to snowball.
I'm not sure people understand what it's like having a child that's going off the rails until they end up dealing with it themselves. It's such a struggle and can really cause the family to break around them.