Men who have children.
The mother or father of an individual's parents.
Women who have children.
Parents who have twins, triplets, quadruplets or other multiples of children who were born at the same time.
Parents with a recently born child.
Men and women who are unmarried, widowed, separated or divorced and who have parental responsibility for one or more children.
Adolescents who are mothers or fathers.
The above terms and definitions are part of the Taxonomy of Human Services, used here by permission of INFO LINE of Los Angeles.