My Ex partner has our 3 children every other Saturday. I've just found out that when he has them he takes them to the local rugby club and leaves them unsupervised for over 3-4 hours my DD is the youngest she's 4 and my DS are 10 and 9. He leaves her brothers looking after her. They told me that they play in the car park and that he leaves the key to his car.
What can I do? My children's safety is my priority