This is also true! The husband-and-wife-with-kids nuclear family is fairly recent and fairly limited thing. People who bitch about "traditional marriage" and how God intended for it to be "one man and one woman" need to got take some Anthropology classes and learn them some culturez. Marriage and families have all kinds of flavors, and guess what? Each of those flavors works out for the people who came up with it. And the world didn't end. AMAZING.