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Parents
Persons functioning as natural, adoptive, or substitute parents. The heading includes the concept of parenthood as well as preparation for becoming a parent.
Year introduced: 1969(1967)
Child of Impaired Parents
Child with one or more parents afflicted by a physical or mental disorder.
Year introduced: 1991
Single Parent
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.
Year introduced: 1989