Years later, after learning the truth about his parentage from his Uncle Morfin, Tom Riddle Jr. came into the Riddle House and murdered his father and grandparents, then placed a false memory in Morfin, making him believe that he killed the Riddles.
Years later, Tom Riddle Jr. came into the Riddle House and murdered his father and grandparents, then placed a false memory in Morfin, making him believe that he killed the Riddles. Tom Riddle Jr. was learning the truth about his parentage from his Uncle Morfin. This was years later.