who us konahamaru's parents?

Help me out people I was playing naruto shippuden ultimate ninja storm looking through the characters then it hit me. Who is konahamaru's parents I know if the third hokage is his grandfather and Asuma is his uncle (so they claim in the show) then did the third had another son or daughter?

It was never mentioned who his parents were. Which is weird because you'd think the son/daughter of a hokage would AT LEAST be talked about once at some point in time.

Not even in the manga? Like really wow they the time out to do all this other unessary background info but doesn't give a glimpse or even the name of his other child. Oh well now I'm even more curious.