Those beautiful teal eyes [Genmui]

Genya has a dysfunctional family with his mother in the hospital and his abusive dad, his brother doesn't talk to him and doesn't want to have anything to do with the other.

Muichiro is part of Tanjiro's friend group and hangs out with them a lot, he has a loving family, except his brother who can be pretty rude to his twin as a joke between the two.

(This is out of character)