Errrrrrrrrrrrrrrrr. Weird Genealogy Question...?

[iamghost.]

OK. hypothetical question...
Let's say Mary Lou has a son, George.
George's testicles drop, and Mary Lou hasn't reached the stage in life in which she can no longer bear children.
Let's say, for some disgusting, hillbilly reason, George impregnates his mother.
What relation is the child to George.
Or vice versa...?
let's say a man impregnates his daughter. what relation to the baby to it's mother's father. Grandparent, Uncle, Father, what?
Or in George and Mary Lou's case, Grandmother, Aunt, Mother what?
My reason for asking is because a few friends of mine were discussing this, and I only got the gist of their argument.
Which is, "What relation is he?"

Weird, I know...
...well obviously he's going to be both.
but shouldn't there like, be a name for it or something...?
other than incest of course.
lol.