You are thinking of Isaac and Esau tho Cain and Abel were also part of attempted deception by Cain.
BTW, does anyone know what the “Mark of Cain” is?
Thanks! And I have no idea what the mark of Cain is. I seem to recall some people saying it was dark skin (Blacks), but I don't know. Didn't muhammad make up that part in the Koran about how the muslims are ancestors of Cain?