Question about Theogony

I like to consider myself fairly knowledgeable when it comes to mythology. I always find the part about the universe’s creation (cosmology) and the birth of the gods (theogony) fascinating. I was reading through the second chapter of the L5R and saw the familiar son-usurps-father theme.

That got me to thinking, are there mythologies that don’t involve this particular theme? I don’t believe the world-egg cosmology involves it, but that’s the only one I can think of.