Does a father’s relationship with his child depend on the father’s relationship with the mother? Among unmarried parents this seems to be so. Researchers examined the effect on a father’s contact with his biological children when one or both of the parents enters a new relationship. When the relationship between unmarried biological parents ends, the chances are very high that the father’s contact with his children will significantly decline. A mother’s new relationship has a greater effect than a new relationship for the father. For both parents the effect of a new relationship is greatest when the children are young.