A unitary family is one MAN and one WOMAN and the children they conceive together or adopt. An extended family is a unitary family plus relations by blood and marriage.
Anything else is something that someone made up to make themselves feel better because they are different and don't like being different.
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
"You will accept me or I'll sue you".
No, but identifying a "family" politely could be a real problem:
The family when none of the kids knows who his Dad is, because their Mom's a junkie ...
The kids who live with those two guys who, well, you know, with each other ...
Britnie and her Mom and the man they're living with, no, not that one, that was last year, this is a new one ...
And don't forget that families can differ for many reasons!