Hi, Tuleeaza and

First of all, I'm so sorry that you and your family are having to go through all of this I have family members with BPD also, so I know what you are talking about... . I know your son is seeing a T for living with a BPD spouse; have you shown him this website? I bet he would get a LOT of good information here that would help him also. Please know that there are many Senior members here on the different message boards who can help any/all of your family members with learning how to deal with and communicate with your DIL. Make sure you check out the
Learning Center Message Boards; there are
Workshops,
Articles,
Book Reviews for book recommendations,
Videos, and lots of good threads to read. Also, of course, the other Message Boards for any subject that seems relevant to any of you.
The best book I've read so far for a great introduction to understanding BPD and learning how to communicate better with someone who has it is "Stop Walking on Eggshells" by Randi Kreger, though there are many others that are also very helpful. This website is filled with information on communication techniques like
Validation,
S.E.T. and
DEARMAN and learning these techniques has changed my life

I have an adult son, another son's wife, and a MIL, with BPD (though only my son has been diagnosed officially), and what I have learned here has made my relationships with ALL of them better

I wish you, your son, and your whole family much luck with this situation