Thanks for sharing
Deb. It's great to hear you've come to terms with what must have been a difficult relationship for you. It's always helpful to know things can get better. I've also gone from strength to strength since limiting contact to with those with a PD in my life.
I've always found comedy a great way of dealing with stubborn behaviour that refuses to change. I appreciate how hard it must have been for you dealing with an NPD with dementia. My mother is like that, but on the upside, every day she wakes up and falls in love with herself again. Not a bad place to be, and that releases her children from having to pander to her ego. It's a win-win.
On a more serious note, we have noticed our BPD mother is losing her capabilities to gas light and re-write history. Did you notice the same with your BPD BIL ? Recently she excused her bad behaviour towards me by saying "But your sister wasn't born then" to which my sister said "Hello, I'm stood right here. I was ten, but you never really noticed me." I'm the scape goat and my sister the lost child in her triangulation. Her golden child hasn't spoken to her for decades. It's funny because it's true.

So how far down the healing rout are you ? Can you laugh at what once was a trial ? I don't mean hysterically whilst rocking, I mean do you feel you've escaped the Narcassists web , re-adjusted from the gas lighting ?