LOTR parents!

[Morai]

I can imagine Sauron's kid being able to change forms, but he would end up as a little everything: a werewolf puppy, a vampire fledgling, a little fiery eye...

That is an interesting point.
One ugly day in Mordor:
Sauron: How many times do I have to tell you not to put the Ring on without my permission?
Sauron Jr.: It didn't hurt me. *turns into an eye and glares*
Sauron: DON'T GIVE ME THAT EYE YOUNG MAN! That's it, you're going to bed up the tower of Baradur without your dinner.
Sauron Jr. : But dad! We're having human royalty stew!
Sauron: No buts young man.
Sauron Jr. *under his breath* I'm a ghastly specter not a man....