"Head of the household" Biological Father or Not

An estimated 24.7 million children (36.3%) live absent their biological
father. --Source: National Fatherhood Initiative, Father Facts, (3rd Edition):
.Children who were part of the "post war generation" could expect to grow up
with two biological parents who were married to each other. Eighty percent did.
Today, only about 50% of children will spend their entire childhood in an intact
family. --Source: David Pocono, American Family Decline, 1960-1990:

Most of the head of household living arrangement today is not the biological father. They are mainly significant others, step fathers, or just ale acquaintances. This can lead to several problems in the young adolescent life.