i just did a post about hashi's kids a while ago and some members brought up a clever point. they just stated that not everyone is a shinobi thus his kid, tsunades dad, was not powerful. therefore, the reason why kishi hasn't gave any info on them.
but to answer your post:
hashi: tsunade...ive seen you've...grown
tsunade: -punches hashi into oblivion-
Hashi: "Hey babe, nice tits."
Tsunade: "Not as nice as your wood."
..........Senjucest? :|