How do Diana and her parents react to Dunny’s decision not to marry Diana?

While staying with Diana's parents over one Christmas, Dunstan and Diana finally confront the question of their future together. He admits that he cannot see himself with her, especially now that he has learned to walk with a prosthetic leg and will soon return to Canada. He feels compelled to live as a new man there. Though initially devastated, Diana eventually understands his perspective, and performs an impromptu ceremony, re-christening him as "Dunstan" from his given name of Dunstable. Diana's parents liked Dunny but accept it.