hi ksm
I think it is time to consider a push for legal custody of your grandson to you and your husband. it is just too risky that the father gets the baby. now that his marriage is going better, he may consent. I don't know the legalities, clearly, but you can find out.
I feel that a tug-of-war with dgd is fruitless right now as the drugs dominate. what is called for are boundaries. she is putting all of you at legal risk and her child at extreme risk of being seized by the system. I wish so much it had not come to this.