Sisters--aren't they wonderful to talk to, especially about family of origin matters ... I've sure spent a lot of time with mine, analysing the past. It sounds as though it must have been difficult, growing up with your dad, but good that you can appreciate the positives in him.
My own father had an MLC himself, though it wasn't until my H had his that I recognized what had been going on back then. Even so, I never would have guessed my H would take the same route.