(((Welcome to SR!!))) - I'm sorry for the situation that has brought you here. There are quite a few parents, grandparents, and great-grandparents who are going through, or have been through, similar situations.
When I first got here, I read a lot and found out my situation was not so different than that of others..a few differences, but still...I found out I wasn't alone, and neither are you.
I'm glad that you are trying to find help for your son and that you have your grandbaby. I'm sure others will be along soon with some ES&H (experience, strength and hope).
Hugs and prayers,
Amy