Cancel grandparent visitation order because of well being of grandson?

[regenweald]

my gson has been diagnosed with adhd and is now in a hospital have a study done to determine what problems he has besides this. he is hurting himself, lying, crying, and much more. he was a meth baby and is now just turned 8. he has been on meds and they worked at first and now not. my son in law has custody with my daughter. my daughter does all she can to get him the help he needs but the grandmother (mom's Mother) keeps bad mouthing my daughter to anyone that will listen telling that my daughter had the doctors put gson on meds and now has put him in this hosptial, she did not his doctors did. grandmother took gsons from daughter because of her habits. my son in law and daughter have custody with gmother getting every 2nd weekend. their mother can now see them with guidance who is her mother. gmother drinks and calls or texts ugly things to my daughter, which their is now another contact bond on her. she is mentally unstable when she drinks which is everyday, but has a job in a hospital as a manager. my son in law and daughter took her to court with all the emails and texts with threats to court and their lawyer never used them. i know the gmom loves the boys but she manipulates especially the 8 yr. old with all the problems. my heart breaks for all of them. my daughter (their stepmom) that is a stay at home mom raising these boys is pregnant with her first child due on1/13. this gmom started out when her daughter was still on meth three yrs ago when their mom lost custody again for the 3rd time, gmom couldn't praise us all for being so good to her gsons. everyone was great relationships. her meth daughter went into a rehab last year and her drug court time will be up next month and she has since had another baby. this is tearing this family apart. gmom tells the 8 yr. old not to mind my daughter, she is not his mother. i am not a gmom to them she told them. what can be done when she has the visitation rights thru her daughter but her daughter will get them on her own next month. these little boys are so confused. the 3 yr old didn't even know his mom until she got visits thru her mom about 5 months ago and it has been hell since then. the hosptial is trying to find all of the 8yr olds problems. he is not socially adjusted. his mom was on meth the entire time she had him. we don't know what happened to him. believed to be locked in his room and people climbed in and out of his window at night. expect there is much in his little mind. and then to be shuffled from his dad and my daughters house and then gmom takes them to visit her mom and sister so it is like a vacation every other week. they go and go and then when they come back the 8 yr old is all messed up again. my kids have spent money they don't have to right to right this for him but the courts seem to fail or the lawyer. I have watched my gson go into a stare and not talk and look at me like he hates me and I have seen him do it to his 3 yr brother. he is suffering and we want to help him and gmom says my daughter is trying to dope him and they don't love him and they need to give him to her. she doesn't want the 3 yr old. Please tell me somthing to help my kids try and raise these boys. they have come a long way in their lives only to be harassed by this crazed woman. why would she even think a md would do something wrong to a child and then acuse my daughter who this woman loved at one point and now is trying to tear their union apart and want to raise this child when she gets drunk every night of the week and because of her title she thinks she can do anything. we have horror stories and lies but she can always lie about what she does and has the nerve to try and destory all my son in law and daughter has done to give these boys a home life and a normal life. by the way my son in law was never married to this girl but had the two boys by her and he had additions too but he has become a wonder dad and husband and son in law but this woman thinks she has control over all they do. help.
thank you
tupie sheppard