thank you for reminding me that i have to hit up mccrea since i only just got the credit added the other day BUT ANYWAY i think if the film stays close to the source, they'll be siblings? so they'll probably be working directly together at some points. he's not a full method actor or anything but he is very serious about work and likes to take time to get into the headspace of his characters. for example, when he's playing someone on the darker side like most of her filmography lbr, he likes to spend a good chunk of time alone before shooting just to kind of stew in emotion. in this case i think he'd want to speak only in french with her on set even when the cameras weren't rolling? which like, i don't even know if they're going to have french accents because lbr hollywood gives everyone in historical european films english accents regardless of where they're from. but still, french all the time, he's sorry for his bastardized version of it and his quebecois accent and slang.