The gap isn't gender, it isn't income, it isn't education. It's marriage, and that determines education and income. Young people from less-privileged homes are more likely to graduate from college and earn more if raised by two married parents--44% more likely to graduate from college if their parents are married. The bump in income is the greatest for children of those families that are intact, but didn't attend college. The association between intact families and income is not significant for children of college-educated parents.