Curate, connect, and discover
I think that if Owen was still alive in the comics, and some how the heros descoverd about his mom ( like aren't the bats the best detectives in the world? Come on Tim, you don't hate boomerang enough to search for all his family historic? If there's a limited number of speedsters and Owen have super speed, it doesn't make sense to not do a DNA test. I refused to think that Tim didn't have thinked in this posibility, more like he just find it out and never told anyone.)
But if Bart end up knowing he had a brother, I think he would want to get closer to Owen and try to help him with the super speed and speed force side effects. Bart and Tim probablly gonna at some point end up fighting, Tim don't want Bart hurt himself trying to help ( and of course Owen in Tim's vision is a dengerous person), and Bart don't like that Tim is geting over protective with him.( came in my mind this scene of Arcane of Jayce and Victor.)
Tim: Did tou go after him?!
Bart: Whats the problem?
Tim: Whats the probl-?!
Tim: Hes a Thawne's grandchild, hes dengerous!
Bart: I'm a Thawne's grandchlid.
Cassie and Kon don't what to do. They understand that Bart want to meet his brother and suport it, but they also know Owen's "fame" ( the Darkest Night 💀).
Sorry,inglesh is not my first lenguage ❤