((Queentree)) Goodness as I read your post, I was wondering if your AD was my AD's twin. Always a difficult, opionated, entitlement issues kinda child.
My AD has 2 children, both by different fathers, and yeah I worry about them alot. First husband was & still is an addict. I actually tried to get custody about 4 yrs ago. Second husband is abusive. (not the the kids)
Between my husband losing his job 1/08, and using any $$ we had put away on AD's bills,etc......we are barely making it, so at this point we would not be able to take on the grandkids either. I certainly understand your concern though. If you feel the kids are in danger, I would definitely call CPS. (my AD has 4+ months clean at this time)
Hugs & Prayers,
Chris