Did any of the episode 显示 Zuko and Mia's kids?

I dont think Mai and Zuko got married. Cause in Avatar: The Promise, Zuko and Mai broke up cause he was keeping stuff from her.

Not yet
I heard rumors that Zuko is in the season finale.
Not sure about the kids though, but there is a 照片 that is supposedly leaked of him and his family

no, not yet

Well, you've got General Iroh who has the same voice actor as Zuko in episode ten. I wonder if they're related... I hope they are.

The episode "Turning the Tides" 答案 that question!

No...I think it's possible that Zuko married Toph, because Toph had a daughter (Lin) in Legend of Korra and no one knows who the father is, and no one knows who Zuko was with in LoK either.