My dad and his siblings had a different experience that your post reminds me of.
His father forsakes his kids and gave the world to his second wife and her adult children and grands.
He paid for college educations, bought homes, cars, etc for them. But if his own kids needed anything he’d either refuse or make them have promissory “loan notes” notarized first.
BPD- is a lot to process and come to terms with for sure!
Whew, I said something years and years ago to my dad...when we couldn’t figure out what was wrong —and I was much younger.
He asked me “well, do you think I could be bipolar?” I said I’m not really sure dad, you’re kinda like crazy soup -a little of this and a little of that and a pinch of this and of that.
Recently, he repeated this to his doctor when he asked what he thought was wrong. He answered “I’m crazy soup.”
Omg! Wish I could take that back, but my dad said It made perfect sense to him.
Hang in there!

Finding this site and talking to all of you have been such a healing for me.