Nuclear family: this includes two parents and one or more biological or adopted children.
Childfree family: this includes two spouses, without children.
Lone parent family: this includes a single mother or father and one or more biological or adopted children.
Extended family: this is a nuclear family, plus one or more relatives such as a grandparent.
Blended family: this includes a couple and one or more children from a previous relationship.
Common law family: this is a couple that lives together, without legally being married. They may or may not have children.