Parenting, apparently, is our family sitcom’s longest-running plotline. How much control is necessary, and when is it time to let go? While my husband prefers to intervene before small problems become big ones, I tend to trust that things will work themselves out. Then our older son walks into the kitchen, listens to us argue and delivers the perfect line: “I feel like I’m in a sitcom, and today’s episode is called Letting Go.” Twenty years into parenting, the debate is still