The idea that children give us structure, purpose, and stronger bonds to the world around us doesn’t always show up in social science data. But it can, if you use the right set of instruments. Robin Simon, for instance, has found that parents who have custody of their children are less depressed than those who don’t. That’s a big departure from most other parenting-and-happiness studies, which suggest that single mothers (who more frequently have custody of their kids) are less happy than single fathers. But there’s a difference between Simon’s study and others: she was measuring depression,
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