Ok, this could be a hasty assumption, but perhaps your dad was schizophrenic as well, or had some other schizophrenia-related disorder, like schizotypal or something? It sounds like he may have had some paranoid delusions and possibly hallucinations. Does that sound right? Or was his hypervigilance caused by something that happened in real life to him, like in PTSD?

Schizophrenia and OCD both have strong biological components. There is some evidence to suggest that schizophrenia is a sex-linked trait, at least in some cases, meaning that it's passed down most commonly from mother to son genetically. But the thing about mental disorders with biological components is that only a TENDENCY is inherited, and it takes environmental stressors to actually cause the disorder to become full-blown. Sounds like your family HAS had those stressors.

I'm glad to hear you will be getting some therapy. I think everyone in the whole world should try it at least once!!

Angela