
No, I don’t think Zuko and Toph are involved at all.
It would make absolutely no sense and would complicate things ridiculously in terms of storyline. It also becomes a bit iffy when all of the characters are somehow related to the previous generation.
I’m not hating on Toko or anything. It’s just there are plenty of other Earthbenders and Firebenders that could have fallen in lurve and had a lovely multicultural family.

Bolin reading a book entitled “How To Be A Man”. WITH A PICTURE OF AANG ON THE FRONT.

Hey guys. It took me 2 hours but I finally put together all the stuff that the fandom knows about Avatar: The Legend of Korra. This is mainly because I anticipate that I’ll be a getting a lot of questions in the near future, hopefully this will serve as an FAQ just for Legend of Korra!
If you follow me please read it, especially before you ask a question!
No that’s just fan conjecture.
My guess is that while Mako does kinda look like Zuko, he comes from an mixed culture family as his brother is an Earthbender and that makes it very unlikely he is a royal descendant. So I would make an educated guess and say no, Mako isn’t related to Zuko or Mai.
AVATAR: THE LEGEND OF KORRA TRAILER (HQ)