My 10 year old son stays with his dad every other weekend and during the first lockdown I decided it was safer for him to remain with me until it was over. During this present lockdown he has been staying there but has been informing me that his dad has been having people over at the house both family and non family members. This weekend I received a text message from my son telling me that he had several members of his family over at the house and that he wanted me to pick him up immediately because he was upset and worried. I messaged his dad and asked why my son wanted to go home, given him the opportunity to explain, however he just said that he hadn't said anything to him and that he was fine and happy. I decided not to pick him up but to confront him about the situation when he returned home and he said if was none of my business to which I said that it was when it concerns the safety and health risk of my son. I should add that after I sent the message to his dad asking why he wanted to come home, he confiscated my son's phone, read all the messages between us, then proceeded to delete his messenger account and didn't give his phone back to him until just before he came home. This left my son angry and upset and not being able to contact me. I am not sure whether to let him go over there the week after next as I know he will continue to blatantly contravene lockdown rules and this worries my son who is confused because he understands the dangers etc. I tried asking again why he is doing to his but he just ignores my questions. I also don't know the law in this situation.