My daughter-in-law looked straight at me across a dining room filled with people and said, “We didn’t plan a seat for you.” She said it in the house my husband and I had spent thirty years paying for, while my son stared at his wineglass and pretended not to hear. I put down the serving bowl in my hands, walked outside without making a scene, and made one decision before the birthday candles were blown out: by morning, I was going to find out exactly how much of my home they thought already belonged to them.