Don't the people who only have one parent have a lot in common? Poverty, for example. And what about the nature of the dad? Do we believe that geanetics don't have any role in anything? If you're a dad who's likely to leave or to not take care of a kid, does that genetic propensity, is it likely to follow to the child? I mean, not every time, of course. But crazy exerqise. Did the did the father leave because mother's crazy? What kind of mental health do couples have if, on average, if they've broken up? Verses if they didn't?! It seems like your selecting for a certain