This was his responsibility, Ron realised. If he gave Bill the address of the Dursley's, he was responsible for everything his brother would do to these despicable muggles. He would also be responsible for his brother learning the truth about Harry's upbringing first-hand. They were only fifteen. They did need as many people in their corner as possible. So, Ron made a choice. "No. 4 Pivet Drive, Little Whinging, Surrey."