Hi and welcome.
First, I am sorry for everything you are all going through, especially the situation with your husband.

Your story is not an uncommon one, unfortunately. We have many members with an in-law with BPD and estranged relationship with their adult child. Not that that makes it any less painful.
Do you think the reconciliation alone is causing the estrangement or did something else happen that may be a factor? What was your relationship with your DIL like before they split? With your son?
Sorry for all the questions. Answer only what you feel comfortable with of course. I am just trying to get an idea of what your situation is. the more detail we have the better we can understand and perhaps guide you.
In the meantime, I hope you read and post more.
