Final answer:
A wet nurse, sperm donor, and child bearer are considered surrogates, roles that are distinct from biological, adoptive, or extended family members. They support child-rearing by providing nutrition, genetic material, or by carrying a pregnancy, but do not fit the traditional roles of parent or family in the conventional sense.
Step-by-step explanation:
A wet nurse, sperm donor, and child bearer are examples of surrogates. These individuals may contribute to the child-rearing process in various capacities. A wet nurse provides nutrition for the baby; a sperm donor contributes genetic material; and a child bearer could be either a surrogate mother, who uses her own egg and the father's sperm, or a gestational carrier, who carries another couple's embryo to term. Neither of these roles would be considered an adoptive parent, a biological parent, or an extended family member in a technical sense.
An adoptive parent is one who legally adopts a child who is not biologically theirs, while an extended family member could be a relative such as a grandparent, cousin, or sibling who takes on a parental role. The idea of 'parent' and 'family' are evolving to encompass more diverse structures and caregiving arrangements beyond the traditional nuclear family.