A family is an anthropological fact.

"Family is an anthropological fact - a socially and culturally related fact. We cannot qualify it based on ideological notions or concepts that only survive during a certain point in time, but eventually they crumble. We can't think of conservative or progressive notions. Family is a family. It can't be qualified by ideological notions. Family is per se. It is a strength per se.”

It's amazing that some people don't know that a family is a married man and woman and their biological and/or adopted children.  The Pope accurately calls it an "anthropological fact," a phrase that is now one of my favorites.  I feel heart wrenching sorrow for the glbt community because they are fighting against the Word of God.  

More info here.