Originally posted by: Hatake Kakashi
Naruto is the son of the 4th, leave it at that. All the pictures of Jiraiya, Yondaime, and Naruto at the various stages of there life match up to each other.

Their ages also match up as well.

Jiraiya is 50

Yondaime would be in his 30's

Naruto is 12 or 13.

All the Gennin look like their fathers, and Naruto and the 4th have a resembalance.

Also in the Tsunade intro arc, Kabuto says something to Orochimaru about Naruto:

"Jiraiya is said to be Naruto's..."

Then he gets cut off by Orochimaru's "HMMM"

I know he could have said student, but that is rather obvious don't you think? Why would he point that out to Orochimaru. I think he was going to say they were grandfather and grandson.

Perhaps in his information gathering Kabuto stumbled upon the relation of Jiraiya, Yondaime, and Naruto.

That is my story and I am sticking to it. (Don't mention that damn Tsunade's brother, he didn't look like Naruto as much as Yondaime does.)
All of this makes sense. A little too much sense if you ask me.

It's my belief that Kishimoto has intentionally made this obvious. He'll eventually unload some major twist, I think. It's just too obvious to be true, he's a better writer than that. At least I hope he is.