Eventually, the Father Project eliminates all but a select few people, two of which require that Don and Rosie travel to New York City. Once there Rosie forces Don to abandon his schedules in exchange for a spontaneous trip through the city, which he finds that he truly enjoys. This culminates in the two almost having sex, only for Rosie to change her mind because she 's unsure that a relationship with Don could actually work out. The two return to Australia where Don continues the Father Project and realizes that his friend Gene may actually be Rosie 's father since he also attended the party and is also very promiscuous. After some thinking Don decides that he will test Gene and that he will also try to convince Rosie to marry him, as he has discovered that he is genuinely attracted to her. Despite trying to change to fit what he believes she needs, Don is rejected by Rosie when he says that he does not feel love like others do. However this rejection causes Don to realize that he actually does love Rosie. He also decides to confront her father Phil over her father issues, as Rosie felt neglected because she believed that Phil prioritized his career over her and failed to fulfill a promise to go to Disneyland, a move that she views as representative of their relationship as a whole. Rosie inevitably discovers that Gene may be her real father and she confronts him over this with his wife Claudia, who was largely unaware of his womanizing. Don arrives at the scene just in time to watch Phil punch Gene, after which point Don and Rosie reconcile and she agrees to marry him. She also reconciles with her father and after she marries Don, the two of them move to America to start anew. The book ends with Don running a final test on a sample of Phil 's DNA, which confirms that he was her biological father all along, and the whole issue was raised by Rosie 's mother because of Gene 's negligence in explaining to his students the rules of eye color inheritance.
who is the father in the rosie project
Phil Phil Phil Phil