Many other children have lived in single-parent families for a time before their biological parent remarried, when they moved into a two-parent family with one biological parent and one stepparent.
At the opposite end of the spectrum, 39 percent of two-parent families earned more than $75,000 compared to 6 percent of single-mother families and 11 percent of single-father families.
One important factor is that home-schooling families are 97-percent two-parent families, and most home-schooling mothers do not work outside the home.
After the child is born, in a two-parent family, the father can step in and spend extra time with older siblings, taking some of the pressure off the relationship between the mother and her older children.
It also provides pregnancy prevention programs and programs that encourage a two-parent household.