When my mum first found out, she basically exploded and I was dragged through family therapy, accusations of causing her a mental breakdown, blackmail and basically pure hatred for years. At the start, I would punish myself for it but then I realised that it was purely down to the fact she didn't understand SH. After I told her more about it and was able to explain that it wasn't her fault, she began to calm down a bit and after some time, was able to talk about it properly.
My dad, on the other hand, I willingly told him and he was okay about it, just curious as to why I had gravitated towards SH and if he could do anything to help.
Both of my parents have MH issues but my mum was also the only one to go loopy about it.
Nowadays, she must know I'm doing it again (some have been a bit obvious =\)but doesn't talk about it because she knows why and it's not her fault.
I do think that most of it stems from misunderstanding.
Do either of your parents now about it now??
Xx