“For my seventieth birthday, I rented a $3,000 Cape Cod beach house and paid for the entire family weekend. Then I overheard my daughter-in-law tell my son, ‘Your mother is just a lonely old widow. She can sleep on the floor.’ I didn’t confront her. I let her take the master bedroom, served the dinner I bought, and waited until morning—because she had no idea what I had already started documenting six months earlier…”