Parents don't want to hear their child is sick. Especially when they can't see it. The thing that got through to my mom was when I had to tell her I cut myself and she's going to see the scars when she saw me. My dad I made a joke about it and left it at that. Neither one asked why which was good but I had planed to tell them if they asked. It showed my pain. It helps that I have a brother in jail for trying to defend himself against a delusion.