Beth was a little girl at the time. She thought it was the coolest thing ever, like a tiny living doll. The way the Mangas think of Bree is more like she’s a pet. They just thought of it as giving their daughter a new pet. They impressed on her to keep Bree secret. Over the years, they slowly bonded together (stockholm syndrome, but at least Beth didn’t take advantage). She even did all she could to keep her brother from ever laying hands on Bree.
Brothers Apart 