Q My son and daughter-in-law divorced a year ago. My daughter-in-law retained the family home, and my son moved in with me. They share custody of a 4-year-old son, who goes back and forth between homes. The parents get along and can work through most problems, but there is one thing on which they don't agree and it is causing huge problems for my grandson. His mother still breast-feeds him before he goes to bed. Sometimes, it is very difficult to get the child to settle down at our house. We've asked her to stop, but she won't. What's good ex-etiquette?