The conversation between Elliot and Avery reveals that even though they are about to get married, they struggle to really understand each other. Presumably, Elliot would never have made that joke about Avery’s nephews if he knew it would hurt her feelings, but she doesn’t tell him that it does, either. Nor does she voice her concern that Elliot’s attitude towards children might mean he doesn’t want to have any, even though Avery does because she loves kids. Furthermore, Elliot doesn’t sympathize with the idea that Avery would return home just to care for her father, which shows that Elliot himself is likely not a very warm or emotional person.