A three-year-old boy, Sita Ramaraju, who was kidnapped from his grandma's house at Cherlapally two days ago, was rescued by the Cyberabad police on Saturday. Three persons, including the boy's uncle, were arrested in connection with the kidnap. The boy's uncle and prime accused A. Venkata Srikanth kept him at an isolated place at Gandimysamma crossroads and demanded Rs. 7 lakh ransom from the boy's family.