I’d assume there is a reason the grandparents have custody of the child.
Bet on it.
Our doped up ex d-i-l has called the police on my wife and me numerous times from a state 325 miles from here to report us abusing the g/kids we have custody of. The chief of police, who happens to be a neighbor and is well acquainted with us and the kids, came to the house to tell us about it the first time and later when I happened to see him in the neighborhood, told me that she has called numerous times since, to the point that he is going to pursue a restraining order and/or pursue harrassment charges against her himself.
The problem with getting charges against her is that the first time is a misdemeanor and this state won't try for extradition for a misdemeanor. He may do it any way and then pursue it again if she does it again. Second offense being a felony.