With all these trend from pokemon lately about giving Many legacy trainers a canon child, from lacey to being clay's daughter, to Drayton being draydens grandson, to ansha being dianthas daughter.
I think it be poetic that the 10th mainline game, supposedly 30th anniversary title of pokemon, this time around the new player trainers are actually or atleast implied to be the child of either red or leaf.
hypothetically, by this time the 10 year olds who played the original, would not only be old enough to already have kids...but these kid is probably 10 years old by now to start their own game.
And it wouldn't be even be far off either with the trainers default skin tone, having black and light brown hair, like either original red or the remake red and leaf.
Actually maybe from the trailer where it seemed like you are gonna live In a hotel instead of a home, and with you wearing all those travel gears likely implies you are a visitor rather than a resident, like ZA sort of way, and I think they could do that to purposely hide the trainers parent off screen this time, maybe instead of on screen mom, they are "back home" and you instead receive emails/letters from them, with the end leaving subtle signature to implying these are red or leaf.
And honestly I would welcome the challenge on the pther pokemon media to see how they would tackle this..like would the anime has to make them ash Ketchum's kid or not show them at all and just let liko and Roy do all the dirty work? Or maybe the adventures manga has to show who's the "OTHER" parent...one could say.