Cohabiting couple family

A cohabiting couple family consists of two people of any sex who are living together as a couple, with or without their child(ren), but who are not married or in a same-sex civil partnership. Child(ren) included in the cohabiting couple family may belong to both members of the couple or only one. Children are included in the family only if they are not themselves living with a spouse, same-sex civil partner or partner and do not have any children of their own in the household.
Cohabiting couples with their grandchild(ren) are also considered a cohabiting couple family if there are no children from the intervening generation present in the household (note that children of the couple may also be present if they are not parents or grandparents of the youngest generation).