Just found out son is in arrears for 2 months rent. He is in last year in uni and been lying saying he has paid rent. Don't know what to do. He is in fragile mental state been seeing gp for anxiety. I don't know what to do. I can't pay all the arrears. He works part time and now I'm wondering what he's been doing with his money. Any advice? There are other issues but this one is the major worry.