Sorry to hear you are having so rough no matter what you do at times you just can't avoid rough times.
I will just pick up on this comment
I know we are suppose to give in to BPD and agree but I pay the bills or we would be bankrupt and I am not about to waste money we don't even have on lawyer who will gladly tell him we have a chance to get our money.
You dont have give in and agree, just state your view as you see it, then dont waste your energy trying to sell it to someone who is not in the mood to buy it.
Often this stuff blows over and reality kicks in and a lot of the big talk and threats die away. By engaging you can turn impulsive threats into something more substantial just out of spite to prove they can't be told what to do.
As for your original question "who are they?"... They dont even know, that is at the root of the problem.