well... no? because they reproduce differently than humans??
It depends on if they are legaly a familly and what familly means i guess?
Because in 100 years 4 generations can be made, more or less depending on where you live in the world, and at that point you have nothing more in common then with a random person out there, so i don't know XD
I have a question too. I also think that Luka is Mist's grandchild. However, the author guarantees happy ending for all 3 couples. Then if Mist and Nan are together, Mist will never marry and have a grandchild. Then Luke will never exist. This changes everything. Maybe I'm missing something.
I don't know if I could express myself.

I'm pretty sure Luka is mists great great grandchild. he said how the stone was passed through many generations and idk how else they Lukas family would've gotten it