A mother is a biological and/or social female parent of an offspring.

A father is defined as a male parent of any type of offspring.

A son is a male offspring; a boy or man in relation to his parents.

A daughter is a female offspring; a girl, woman, or female animal in relation to her parents.

A sibling is a brother or a sister; that is, any person who shares at least one of the same parents.

Grandparents are the father or mother of a person's own father or mother.

Family functions

Society cell

Diversity

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Archaeologist Lewis Henry Morgan (1818–1881) performed the first survey of kinship terminologies in use around the world. Though much of his work is now considered dated, he argued that kinship terminologies reflect different sets of distinctions. For example, most kinship terminologies distinguish between sexes (the difference between a brother and a sister) and between generations (the difference between a child and a parent). Moreover, he argued, kinship terminologies distinguish between relatives by blood and marriage (although recently some anthropologists have argued that many societies define kinship in terms other than "blood").
Morgan made a distinction between kinship systems that use classificatory terminology and those that use descriptive terminology. Morgan's distinction is widely misunderstood, even by contemporary anthropologists. Classificatory systems are generally and erroneously understood to be those that "class together" with a single term relatives who actually do not have the same type of relationship to ego. (What defines "same type of relationship" under such definitions seems to be genealogical relationship. This is more than a bit problematic given that any genealogical description, no matter how standardized, employs words originating in a folk understanding of kinship.) What Morgan's terminology actually differentiates are those (classificatory) kinship systems that do not distinguish lineal and collateral relationships and those (descriptive) kinship systems which do. Morgan, a lawyer, came to make this distinction in an effort to understand Seneca inheritance practices. A Seneca man's effects were inherited by his sisters' children rather than by his own children.
Morgan identified six basic patterns of kinship terminologies:
• Hawaiian: only distinguishes relatives based upon sex and generation.
• Sudanese: no two relatives share the same term.
• Eskimo: in addition to distinguishing relatives based upon sex and generation, also distinguishes between lineal relatives and collateral relatives.
• Iroquois: in addition to sex and generation, also distinguishes between siblings of opposite sexes in the parental generation.
• Crow: a matrilineal system with some features of an Iroquois system, but with a "skewing" feature in which generation is "frozen" for some relatives.
• Omaha: like a Crow system but patrilineal.

On the other hand family structures or its internal relationships may affect both state and religious institutions. J.F. del Giorgio in The Oldest Europeans points out that the high status of women among the descendants of the post-glacial Paleolithic European population was coherent with the fierce love of freedom of pre-Indo-European tribes. He believes that the extraordinary respect for women in those families meant that children raised in such atmospheres tended to distrust strong, authoritarian leaders. According to del Giorgio, European democracies have their roots in those ancient ancestors.