Final answer:
In the novel 'Rain Reign,' Rose's Uncle Weldon lives half a mile, or 880 yards, from Rose, a detail that ties into her love for homonyms and prime numbers.
Step-by-step explanation:
In the book Rain Reign by Ann M. Martin, the protagonist Rose Howard has an Uncle Weldon. It is revealed that Uncle Weldon lives exactly half a mile from Rose. The specific distance is an important detail within the narrative, reflecting Rose's love for homonyms (rain, reign, rein) and her interest in prime numbers - one she often mentions is the fact that half a mile is equivalent to 880 yards, or 2,640 feet, which is important to her as she loves numbers.