What are my chances of having a mental disorder?

I'm sorry to hear that you and your parents have severe mental health issues, I have Asperger's syndrome too, well a mild to moderate form of it, as well as undiagnosed OCD. Mental health issues can pass on to each other especially those who are unaffected as they are at risk of depression and distress, you and your whole family need to see a psychologist to evaluate yourselves, good luck:)