The "chicken and egg" problem. Why are the children poor? Could it be that mom and dad were underperforming slackers in school and can't make a decent living now? Poverty doesn't cause behavior problems. Behavior problems cause poverty. Once it starts, the bad behavior and poor living conditions persist. Mom and dad are too stupid and ill behaved themselves to break the cycle. Children of "wealthy" parents often misbehave as a consequence of neglect while parents are pursuing the almighty dollar and indulging themselves. Inherited wealth rarely persists beyond a generation as wealth is a consequence of behavior that isn't understood by the inheritor.
Anecdotely, I remember the kids who were suspended in school and they tended to be the poorest kids. Very seldom was a middle-class or rich kid suspended. In our case, however, we were given the option of performing "work" after school to avoid suspension i.e. cutting the grass. This was to avoid getting zeroes for the tests that were missed. The poor kids never seemed interested in that. They just took the days off. I was friends with one of the kids (druggie) and he told me the days off were preferred because they had to pass him anyway. Since they couldn't flunk him and he didn't care about his grades, he stayed at home and smoked dope when he got suspended while his mom worked. Win-win in his eyes.
Oddly, he told me that the teachers gave him F's but the principal always changed the grades so he would pass. A high number of kids flunking looked bad for the principal.