You're correct in your statement. The schools I've been at, with 95% of the kids getting free lunch due to income in the household, are highly single parent (or grandma or guardian) households. And teachers tell me that maybe 10% of the parents ever come to parent-teacher conferences. Contrast that to middle class parents who likely have a parents and often 2 incomes and take a more active role in their kids education. And not making this a racial thing but it's a sold fact that black kids have a father in the house about 25% of the time. So Mom, often with minimal education, is working at something low paying, the family receives assistance (food stamps, section 8 housing, Medicaid). Mom often has more kids than she can take care of. So Mom then doesn't have the time or energy to be attentive to the kids -- help them with homework. Two parent families don't have all these challenges.
It's highly correlated statistically that single parent families living in poverty end up with worse outcomes for their kids as far as educational achievement or likelihood of later criminal activity.
Yet again, DickHead is wrong. According to the census data, 50% more white children are in single-parent homes than are black children.