Hi Jane29
Thanks for introducing yourself after lurking for a few years.
Dealing with multiple BPD family-members can by quite challenging. You have a sister with BPD but currently your main problem is the situation with your son and your BPD DIL.
I am sorry you now have so little contact with your son and your grandkids, one of them you unfortunately haven't even met yet.
Your son is an adult and of course responsible for his own decisions, but the fact that he has Asperger's might make him particularly vulnerable to pressure from people. We have an article here about fear, obligation and guilt (FOF) that I think you might find interesting:
... .fear, obligation or guilt ("FOG" are the transactional dynamics at play between the controller and the person being controlled. Understanding these dynamics are useful to anyone trying to extricate themselves from the controlling behavior by another person and deal with their own compulsions to do things that are uncomfortable, undesirable, burdensome, or self-sacrificing for others.
Would you say your DIL uses fear, obligation and/or guilt to try and control your son?
You can read the entire article here:
Fear, Obligation And Guilt: How We Allow Loved Ones To Control UsYou mention your son being fairly socially handicapped. Would you say that he has a history of letting himself be controlled by other people?
Your son does have a good job in the tech industry. How is his relationship with his co-workers?
Welcome to our online community
PS. Don't worry about it, your post wasn't that long at all