Your response very much depends on how seriously at risk you think the child is
I am the grandmother of a six-year-old boy. The mother divorced the father four years ago because of abusive behaviour. Although both parents are British, the mother and her son live in the UK and the father in another European country. The child has a chronic condition which means frequent visits to hospital and daily medication.
The father remains extremely hostile to the mother. Access has been arranged by court order, and the mother is very conscious that the child needs time with his father, which she tries to facilitate over and above the court order. The child’s medication and update on his condition need to be passed over at the handover, but this doesn’t happen because of the father’s hostility.