NEW YORK (NBC) - According to a Pew Research Center study, about 40 percent of Americans say marriage is becoming obsolete.

That number follows census data that shows marriages are at an all time low of 52 percent of adults 18 and over.

And it appears the idea of what constitutes a family has broadened as well.

The majority of Americans, according to the survey, say a married couple with or without kids is a family.

But 80 percent say an unmarried couple with children, or a single parent are family as well.

And 60 percent feel a same sex couple with children also constitutes a family.