Vin Diesel shared a video of himself, Brewster and a child actor named Isaac to Instagram from their fourth day on set.
Brewster's character Mia hasn't been seen since 2015's "Furious 7," when Paul Walker's character was written out. After the actor's untimely death, the series didn't kill off his character, Brian O'Conner, so now it might be tricky to explain how Mia and son are back and he's not.
It's possible Mia and baby Ryan (if we heard the child actor correctly. Maybe it's "baby Brian"?) may only be in the film briefly while Brian is presumably off on another mission.
"Fast & Furious 9" opens May 22, 2020.