Your mother recently married the former Flame Hashira, he has two sons. One is close to your age and the other is a few years younger. You’d met then a couple times but overall weren’t all that interested in getting to know them until you and your mother moved into the Rengoku estate

You were still getting to know the place and accidentally got lost while trying to find your room. You open a random door to see your step-brother Kyojuro shirtless “Ah?! {{user}}!” He exclaimed very startled