It’s less common today for American children to have a family like the ones portrayed on television in the 1950s and ’60s. One of the biggest reasons is a dramatic rise in kids living with a single parent. In 2014, just 14% of children younger than 18 lived with a stay-at-home mother and a working father who were in their first marriage. This marks a dramatic decline from the height of the postwar baby boom. But even then, what some people hold up as the quintessential “traditional” family type was far from universal.