Hi SeekSusan,
this is a very difficult situation for all of you. Kudos however first to your son to escalate an unbearable situation to the authorities. This took a lot of guts by him and while the action was painful for everyone it was also necessary. It is worth validating that particularly considering that
I have allowed this order to be broken because of the children and our family finances.
which may indicate to him that the did the wrong thing.
Ideally the order should have been maintained, these tools exist for a reason. It is also common that they are not maintained as people feel they are unworkable. It does not make your life easier however as the situation you describe... .
... .increasing verbal and then physical violence... .
... .is a sign of lacking effective boundaries and a total erosion of respect. Dealing with such a situation is an uphill struggle .
In the recent past the situation has escalated and there were some - limited - consequences for her. Often such an escalation is validating the pwBPD and this can be calming for a little while. This can be an opportunity for you to push back on disrespectful behavior and get some basic
boundaries (
Setting Boundaries) in place. Financial constraints may limit your options at the moment - I would still encourage you to work on that front too.
The clearer you are about what your options are and what price you and others may have to pay to protect your boundaries the less rage you have to deal with. And a decision whether or when to split up or not is less likely to be forced on you.
You wrote your wife is diagnosed. Is she or was she in therapy?

,
a0