The every-other-weekend dad, born from two generations of soaring divorce rates, was once a conventional part of American culture. In recent years, more couples have been agreeing to parent after divorce as they did in marriage: collaboratively.

Now lawmakers are accelerating this trend toward co-parenting, with legislatures in more than 20 states this year considering bills that would encourage shared parenting or make it a legal presumption — even when parents disagree.

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