Please answer the following question: Given the following context:  After the untimely death of a small-town church choir director in Pacashau, Georgia, Vi Rose Hill, a no-nonsense mother raising two teens alone, takes control of the choir using the traditional Gospel style that their Pastor Dale approves of. However, the director's widow, G. G. Sparrow, the main benefactor to the church, believes she should have been given the position. As in previous years, the choir reaches the regional finals of the national amateur "Joyful Noise" competition, only to be disappointed when a rival choir beats them. Tough times in the town have led to budget problems that threaten to close down the choir, at the same time as the town needs the choir's inspiring music more than ever. Vi Rose has a son, Walter, who has Asperger syndrome, and a talented, pretty and ready-to-date daughter, Olivia. But Olivia is not ready to date under her mother's household rules. G. G. has recently begun caring for her rebellious, drifter grandson, Randy. A romance blossoms between Olivia and Randy, which is strongly opposed by Vi Rose. Olivia also has a rival suitor, Manny. At Randy's urging, G. G., Olivia and most of the choir come to believe that some more contemporary arrangements (prepared by Randy) would be more successful for the choir. It also turns out that the choir has a chance at the national finals of the competition when the rival choir is found to have cheated by hiring professionals. But the pastor says that the church will not sponsor the choir unless they continue to use their reverent, traditional style.  answer the following question:  What are the first names of Vi Rose Hill's two teens?
Answer:
Walter