Dear Prudence,
I love my sister but over the past few years, she has grown morbidly obese. She can barely walk and needs to sit down every few moments. She isn’t even 40 yet and she moves like our late grandmother. My cousin and I had plans this summer to go to New York City and sightsee, which involves several walking tours. My sister wants to join us and foolishly thinks that she will be able to keep up. The last time I visited her, we took her dog on a walk to the park. We didn’t even make it before my sister got fatigued. I had to turn around and get the car to get her home. I am not mentioning her weight to her. It wouldn’t do any good but hurt her feelings. I don’t want to exclude my sister but I am not shelling out thousands of dollars for a trip to be stuck in a hotel room with her. How do I have this conversation with her?
—Walk Around