Historically, even as adults, we have lived near our parents, siblings and cousins.  When we had parenting struggles, we also were surrounded by a host of people we trusted.  Furthermore, we tended to gather in homogeneous neighborhoods, communities and uniting cultural institutions, like a common church or temple or the Italian (or Irish or Swedish) American Association.  We also were more likely to have grown up babysitting, lifeguarding or scooping ice cream, giving us micro experiences with kids of different ages. 

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