I personally think the dad is a jerk. I can understand how he developed this personality (having to fight so many tough battles his whole life) but still ... its not really an excuse for being a jerk. I seem to remember an episode (or maybe it was in the discovery special about their family that was aired a while before they had a tv show) where the mom was really anxious about money because he is such a "dreamer" -- always pursuing crazy pipe dreams instead of having a steady income. She has to work *all the time* to support the family, and notice that she also does childcare, housework, ferries the kids back and forth to all their activities, etc, while he gallivants off to conventions and conferences. I don't get the feeling they equally share in household duties.
I have to say that gf and I also wondered about their source of income ... we first started to wonder about it in the episode where Zach has brain surgery to repair a stent in his brain. I believe there is some sort of monologue by the dad about how they don't have insurance because it's hard for disabled people to get insured (very true), and then he says something like, "well, we'll just have to figure out how to take care of the bill" (please correct me if i'm not remembering this correctly). Now my question was this ... brain surgery and several days or a week intensive care is not expensive ... it is exorbitant ... probably running several hundred thousand dollars or more. How exactly could *anyone*, let alone people who don't seem to have a clear source of income, afford to pay for this???