Hi JackiB
Welcome to bpdfamily I'm glad you found us and sorry what you are dealing with your son, parents here understand what you are going through, you are not alone
In answer to your question about genetics here is a helpful conversation and results of research studies
What is the cause of borderline personality disorder? Has your son received treatment for ADHD/ODD at any time? Does he share with you about how he is feeling, his behaviour?
WDx