A.,
As an adult (37) with recognizable OCD since I was 10 I can tell you one thing for sure...OCD becomes a part of a persons "identity". Possibly he/she is worried that it is "who they are" vs. just a part of who they are and they are scared to lose it? I dealt with my OCD (counting, light switches, everything in even numbers, routines to ensure my families safety, etc...)on a daily basis and was unsure who I would be without it. I had a "freak out" when I was in my late 20's and finally went on medication and a little bit of therapy. My OCD, inherited from my mother, was all about my Mom dying when I was 12 and me feeling I could "control" things through my OCD (for example...if I touched the car door 8 times I wouldn't get in to an accident) I felt I was to blame for her dying because I didn't follow through on some odd routine. It wasn't really until my first daughter that I was able to "let go" of it because I simply didn't have the time for all the counting, routines, etc... I was torn...if I didn't do certain things, something would happen to my daughter, but if I did do them, she was without me. My OCD weakens when I am pregnant (my 3rd daughter is due in August), but it surely "attacks" afterwards. I take medication and deal daily with my issues, BUT, most importantly I know that my OCD does not define me...Maybe once your child conquers that "fear" of being nothing without their OCD they will seek treatment? The best book I ever read is called "Over and Over Again, Understanding OCD"...maybe get this, atleast for yourself, for a better understanding.
All the best,
S.