Aww man
Finally spoilers worth commenting on.
Early on before Wano even started I entertained the notion of Kaidou having offspring of some sort, but once the arc started and the longer it went on that possibility seemed to diminish because it felt like adding an unnecessary layer to what already is a convoluted, overcrowded arc.
But now, I'm all for it! Won't speculate on power levels and rank yet. If he has any. Of course he could be a complete nerd:
Kaidou WSC World's Strongest Creature
Kaidou Jr Worlds' Brainiest Creature
It could be a Momo situation, but we all know Momo will eventually grow into becoming more like his father, so there's that.