Do we know of any of Roronoa Zoro's family?
Nothing has ever been shown of Zoro's family, and he has never mentioned them. We know from his flashback that he trained in Kuina's father's dojo from a reasonably young age, and that even before that he traveled around as a reasonably good swordsman.

There's a chance he might have family on Wano Kuni, but I think it's unlikely. We don't know if he knows his family, or if he grew up as an orphan, but he has been without a family for a long time now.