try messing about with the sons friend show him to the bathroom tuke me awhile to work that bit out
it first came up for me around 29 or 30 corruption your son has his friend over go into the sons room pick to talk to the friend hell ask if you can show him to the bathroom pick yes and youll notice something has erm grown haha hell ask for help just say yes then keep doing that when you see his mate over and soon youll get to show him what you room looks like just make sure you have protection from the market