hi rudyb, and

youve come to the right place, friend. we can help you get and stay grounded. you can get good feedback here, as well as support.
i think that a lot of us struggle in our relationships, with anger, with overreacting, or with underreacting and woundedness. theyre challenging relationships, no doubt. a lot of us cope in ways that are understandable, but dont necessarily help matters. we can learn new, better coping mechanisms and control over our lives. there are a whole host of tools that can help you in your circumstances.
the first tool that we teach here is called Wisemind, the synthesis between our emotional and logical mind. gaining control and mindfulness over our triggers and our reactions can help us make better decisions when the pressure is on:
https://bpdfamily.com/content/triggering-and-mindfulness-and-wise-mindliving with two people with BPD traits is doubly challenging! its not uncommon for parents in law to be a source of tension in the relationship, but i imagine you must be pretty stressed. it will help in addition to posting on this board, to visit the Parent/Sibling/In-law board.
for now, what would you say is the primary source of conflict between you and your wife?