When my daughter volunteers this information, and displays excessive anxiety only since she returned from China, and crying and screaming "Daddy, daddy don't leave me alone!!!" when her mom is coming to pick her up after work
Ok......but why do you ASSume this has something to do with her spending a single night with your wife at OM's house, rather than with her traveling halfway around the world to a foreign country and being separated from you for a long trip?
