The children of couples who are married and stay married do better by every known criterion than the children of all other arrangements. For example, children who live with both biological parents repeat grades at only one-third to one-half the rate of children in other parenting arrangements. Children who live with both biological parents are treated for emotional disorders at one-fourth to one-third the rate of the other parenting arrangements. Among the most surprising outcomes (beyond better grades and lack of depression) are the findings that the children of stable marriages mature more
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