Hello Ivory and welcome to BPD Family. You found a great place to get the information you seek and some support. This site has a board dedicated to parents of children (including adult children) with BPD. Here is the link to the board:
https://bpdfamily.com/message_board/index.php?board=4.0You are welcome to post here too or any other board for that matter, but I think you may benefit more by posting/reading on the parents board.
While I am not a parent of a person with BPD, I might be able to help with more general questions or be able to direct you to specific threads. Let me know if you need some help.
Take care.