Harvester of Eyes writes...

I have a question concerning half-breeds. Perhaps you've answered it, but I've perused most of the questions concerning the third race, Oberon's children, and Fox. Anyway, if Merlin is the offspring of Oberon and a mortal human, does that make him immortal? Arthur seems intent on finding him at the end of the episode "Pendragon." Would this also mean that Fox, being the offspring of a similar union, is immortal? Does whether or not the immortal parent is male or female have any bearing on this?