Salva was in school and the war started and he heard gun shots. He was just a young and boy that was scared that he wouldn't see his family again.
Salva is mourning that uncle has passed away. This shows he is growing because he says he says he's getting stronger. He needs to do this so he will on his journey and not give up.
Salva loves his new family. He got news his dad was alive. This shows his growth because he got all the way from Kenya to New York and raised money for water. Salva was hard working and successful in the end.