A natural, adoptive, or substitute parent of a dependent child, who lives with only one parent. The single parent may live with or visit the child. The concept includes the never-married, as well as the divorced and widowed.

Persons functioning as natural, adoptive, or substitute parents. The heading includes the concept of parenthood as well as preparation for becoming a parent.

A household that includes children and is headed by one adult.

Size and composition of the family.

Social and economic factors that characterize the individual or group within the social structure.

Child with one or more parents afflicted by a physical or mental disorder.