Their situations aren't identical, but they're similar enough that Joan knows that Ted does understand in a way only those who have lost their fathers can. And she's not surprised at all by his reaction to her half-sister. Personal connection is so important to Ted, central to his life and his purpose. Joan thinks about Lin, hoping she's doing okay, and resolves to have lunch with her when she gets back to New York.

Whenever that is.

His question draws a smile. "Jingyi," she tells him, using the Mandarin pronunciation.