I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: The War Movie plot: The War tells the story about a young boy named Stu (Elijah Wood) and his father Stephen (Kevin Costner), who is a recovering war veteran. Stu, his sister Lidia Simmons (Lexi Randall), and their friends are determined to build the ultimate tree fort during their summer break. Stu's father has equally high hopes of rebuilding his life and the life of his family. Stu is constantly getting into fights with everyone who says a bad word about him or his sister. Especially a group of children, who Stu considers to be the lowest of the low, the Lipnicki's. Stephen, Stu's father realized what was worth fighting over and what wasn't, and so he tries to help Stu understand that he needs to pick his battles. Lidia, meanwhile, is off in the Lipnicki's junkyard, scavenging for the items they need to make the tree fort. She runs into Billy Lipnicki (Christopher Fennell) on one of her trips, and pays him ten cents to stay quiet. Once the tree fort is completely built, Billy spends all the money he got on ice cream. His father and brothers and sister find him with them as confront him about how he got all that ice cream. His eldest brother shaves a portion of his head and Billy tells about Lidia taking stuff from the yard. The Lipnicki's go to the tree fort and make a dare with Stu, whoever swims across the water tower while it's draining and back, gets to keep the tree fort. The Lipnicki's back out of the dare, but Stu goes through with it. The Lipnicki's promise to not take the fort, and one of the Lipnicki's throw the lock and key to the fort on top of the old water tower roof. Stu gets the lock, but couldn't reach the key. Later that day, Stu's father is in the hospital because of an accident at his work. A few days later, Stephen dies. That day, the Lipnicki's break their promise about staying away from the tree fort, and take it from Lidia and her friends. Stu finds his father's old crate of war items, face paint, smoke bombs, grenades, and his father's army tags. Stu and his friends start a war with the Lipnicki's to... My question: How are Stu and Stephen related in the movie?
Father and son