"It's a long story; and parts of it aren't too nice; but; let's just say that your Aunt and Uncle were not very nice people. Trixie had been under a severe form of the Imperious Curse ever since she graduated from Hogwarts. Until her late husband met his fate. I encountered her not long after that happened, and she was confused and thought I was James. She begged me for help, because she didn't understand what had happened. I've been hiding her ever since and, as much as I hate to do it;" he said, as his wand appeared in his hand; "I will obliviate you to keep you from giving us away."