I had a friend back 20+ years ago and her family of two dads and 3 moms lived together out in monmouth oregon. There was a 4th woman who left early on, but the five parents that remained all helped raise 10 children. It was a very hippy dippy group, but they loved their children and all pitched in. If something happened it would have been a shame if one of the parents would have been unable to see their children.