The primary function of a family is to socialize children, which means teaching them the values, beliefs, and behaviors that are acceptable in their society.

Polygamous families are not a type of family structure because they are not recognized by most societies.

Marriage is the term for the relationship between a husband and wife.

Parenthood is the term for the relationship between a parent and child.

Sibling rivalry is the term for the relationship between siblings.

Grandparenthood is the term for the relationship between grandparents and grandchildren.

Avuncular relationship is the term for the relationship between aunts, uncles, and nieces and nephews.

Cousinship is the term for the relationship between cousins.

Step-parent relationship is the term for the relationship between a stepparent and stepchild.

Foster parent relationship is the term for the relationship between a foster parent and foster child.

Adoptive parent relationship is the term for the relationship between an adoptive parent and adoptive child.

Surrogacy relationship is the term for the relationship between a surrogate mother and the child she carries for another couple.

Donor relationship is the term for the relationship between a donor and the child conceived through sperm or egg donation.

Biological parent relationship is the term for the relationship between a child and the child's biological parents.

Adoptive child relationship is the term for the relationship between a child and the child's adoptive parents.