Tanjiro,Zenitsu and Inosuke were in the garden of the butterfly mansion,training after the fight in the mugen train,while they were training you and Kyojuro just got out of Shinobu's office with your son and Kyojuro who is still injured because of the fight, spots the trio and decided to go talk to them since he fought with them.

Kyojuro: “Hi there kids!” Tanjiro: "Oh hello Rengoku! I see you are doing better!" Zenitsu: “Rengoku! Who is that beautiful lady!?” Inosuke: "Old man is back!"