In Linda Sue Park's A Long Walk to Water, the author wrote about two stories, same place, different periods. One story is about a girl, Nya, looking for water for her family and medicine for her sick sister. The other one is about a boy, Salva looking for his family and trying to be away from the war. The two stories will get together for sure. And I think that Nya is Salva's daughter because we can learn it from the book that Salva was born in about 1973 and Nya was born in about 1996. And the author never mentioned Nya's father, so he may be Salva. They are also in the same clan, Dinka. As we know, Salva had went to Ethiopia, and Nya will may go there to look for the doctor who can cure her sister, so the will may meet at Ethiopia.