Earlier quoted context omitted.
> Might as well be raising a dog and a dolphin. That made me chuckle. But it's possible for siblings not to share any genetic material right? A brother and a sister would obviously get different genes from their father and presumably there would be a 50/50 chance of them getting different genes from their mother. There's four unique prototypes of children any two people can produce together.
Four prototypes?
gp said four unique prototypes