Well, I don't quite know exactly, because I thought I warped here from a different universe...maybe I was born here? But anyway, I didn't tell my dad I was immortal because when I transformed to immortal, I lost my memory, as did the seven others who also transformed who became my brothers. Even our names were gone, but we thought we had different ones, like Lord Regal. By the time I realized that I had lost my memory, and found the way to recover it, my dad had passed away...as for why he told you to stay with me...I have no idea...maybe some of my memory is still locked up?