Exactly. We know Demora exists, and we know Akira exists and his her grandson.
The existence of any person in between is pure speculation. We'd be essentially making up a Human being which has not been seen or referenced directly.![]()
That's splitting hairs. If there's a grandson, then there is a son or daughter. An adopted son or daughter is no less real than a biological one.

. I recently read 11/22/63 by Stephen King. I´ve had my fill of it, even if I liked it.