You inherit certain traits, both physically and psychologically, from your parents/ancestors. But most of a persons psychological development is from environmental factors, and has little to do with biology.
Some of the factors that influence a child's psychological development include prenatal care and nutrition, childhood nutrition, maternal bonding, and parenting skill and style. Social status, area of upbringing, and wealth/poverty are also huge factors in this equation.
You also seem to be confusing what I said in my original post. I never said anything about whether or not it's better for children to be in a single or two parent family.
If you can find it, watch the documentary: Are all men




philes? circa 2013. It gives a great insight into the way human beings are biologically wired.