Well the obvious question is:
Who are naruto's relatives and what happened to his parents?
You could guess that both died fighting the Nine Tails but this wouldn't be possible since Naruto's mother was said to have just given birth to him (the Nine Tails was said to have been sealed in a newborn). There is the possibility that she died to extensive bleeding from the birth but it seems a bit far fetched so I'm raising the question.

Also if you pay attention to the Kohona and the people of the Anime you'd notice that there are no other blondes besides Naruto and the 4th. (Correct me if I'm mistaken) Now I don't know if that seems odd to you but top that with the fact that Jairya wasn't surprised in the slightest to find out that Naruto was the "Nine Tails Kid" makes me think that he could have immediatly recognized him for the 4th's son? Also there seem to be a few old people in the town of Kohona, would Naruto still have a grand father or grandmother if anything? Maybe even a cousin?