just found out that someone that our child knows is closely related to him. I asked the child's mum a couple of questions as I suspected it and it seems the child has looked at his mum's phone and read our chat. The child has since been spreading this round social media and being threatening to my child. They live half a mile away. I tried to call the mum and she's not answered my text message. I wanted to meet up and talk about it but her child has now made everything difficult. It's going to be a shock for them to find out they are related, unless they already worked it out
How would you handle this ?