Welcome, Bman61!
I wanted to take a moment to welcome you to the discussion forums. I'm so sorry for what you're going through but glad you have found a community where many of us have been through similar experiences, and we can learn from each other. From what you have written, it seems clear you will get good ideas and support here if you continue to read and post. In short, you have found the best place in the world for understanding, compassion, and education as it relates to coping with people who have personality disorders.
Thank you for sharing with us what you have thus far:
Oh well we are trying to make the best of it but it’s heartbreaking when you deal with someone like this. Thanks for all the info on BPD. It has helped me cope.
I just have to applaud you for being willing to continue to put forth effort into understanding your son's situation. In my opinion, that's true love - you love your son and grandson and want to know more about what your son has been dealing with. This site is rather HUGE, however, there are many, many articles related to bettering your relationship with your grandson's mother with the angle of using healthy communication techniques, setting needed boundaries, and validating what is valid. You will find these articles in the right-handed panel on this board. We can help you with questions, point you in the direction of additional resources, or just be a sounding board.
It is possible that your son would also benefit by visiting the forum here, so that he, too, can receive support.
Keep writing. It helps you to get it out, and it helps others when they see that they are not the only ones suffering. We look forward to hearing more from you.
Keep writing, keep processing, keep learning!
-Speck