David Brooks: The Nuclear Family Was a Mistake – The Atlantic

“on average, children of single parents or unmarried cohabiting parents tend to have worse health outcomes, worse mental-health outcomes, less academic success, more behavioral problems, and higher truancy rates than do children living with their two married biological parents. According to work by Richard V. Reeves, a co-director of the Center on Children and Families at the Brookings Institution, if you are born into poverty and raised by your married parents, you have an 80 percent chance of climbing out of it. If you are born into poverty and raised by an unmarried mother, you have a 50 percent chance of remaining stuck.”

David Brooks: The Nuclear Family Was a Mistake – The Atlantic

The extended family, even if unrelated by blood or marriage, is especially helpful for people of lower income.