When our son Noah was young we spent several summers in the Hamptons in a rented house a short drive from both the beach and the town. One summer my husband Danny invited his business colleague Stan to join us for the weekend with his wife Lynn and their two sons. Noah was about five at the time, and their sons Josh and Mikey were probably four and six. The three boys played nicely together, but I couldn’t help noticing that Stan and Lynn seemed over-anxious with their...