WHO ARE NEW NINJA JIN AND MIRA FROM NINJAGO LEGENDS?

Seriously, I'm getting mad while trying to understand who they are. I think they can be Kai and Nya son and daughter. I mean, Just take a look to Jin and will notice he has brown eyebrows like Kai and also a similar facial expression. Instead Mira has the exactly sale eyes as Nya, and the bionde hairs may come from Jay's mother Libber, as blondness being a recessive trait. The proof would be that in the new twin titan mechs you can swap Kai and Nya's faces with Jin and Mira's, like if they...