The custodial parent is the parent a child normally lives with, and often the one who makes legal decisions concerning the child, especially if he or she has sole legal custody. When parents dispute custody, usually the courts award it to the mother. Not because it is gender bias, but because the mother is oftentimes the parent the court feels is best suited for the responsibility.

Although courts seem receptive to awarding custody to the father in some cases, usually the mother receives children, particularly when they are very young. The established bias in favor of the mother -- called the Maternal Preference -- prevailed throughout most of the twentieth century. The Maternal Preference and the Tender Years Presumption, which assumes that children in the tender years are better off with their mothers, still influence the thinking of the judges.

Although the so called Tender Years Presumption has become abolished by statute in some jurisdictions, courts still tend to award children to mothers. The Tender Years Doctrine lost favor in the 1970s, when courts became more receptive to awarding men custody.

In most cases in a divorce involving un-emancipated children, the mother gets custody unless she is egregiously incompetent. The burden of proving incompetence falls to the husband. Very often in divorce, divorced mothers end up alone in the marital home with custody of the children. This situation is an application of the so-called Maternal Preference -- here meaning the children are better off with their mothers -- and an application of the best interest idea -- here meaning that it is in their best interest to be disrupted as little as possible by a divorce.

In awarding children to the mother, courts appear to be guided by various readings of theories of attachment that maintain that infants and small children should not spend time away from their primary caregiver or they may never be able to develop appropriate trust in another person. The application of this theory in custody disputes favors the mother.

The Maternal Preference is a complete reversal of nineteenth century practices when children of divorce were routinely awarded to the father, who was considered to be their owner.

Even when the noncustodial father makes good his child support payments, the financial strain on the custodial mother is often very great, and the single-parent families headed by a mother are often constantly on the edge of poverty. A woman who is a single parent managing home and children in this situation carries a very heavy load.