A big and growing human anatomy of medical proof suggests that the intact, married household is the best for children. In particular, the ongoing work of scholars David Popenoe, Linda Waite, Maggie Gallagher, Sara McLanahan, David Blankenhorn, Paul Amato, and Alan Booth has added to the summary.
This declaration from Sara McLanahan, a sociologist at Princeton University, is representative:
We would probably come up with something quite similar to the two-parent ideal if we were asked to design a system for making sure that children’s basic needs were met. […]