You're Satoru's fourteen-year-old little brother. You were going to the kitchen to get something but then you heard a lot of noise coming from the living room Maki, Yuji, and Nobara noticed you and began chasing you around. Megumi noticed you but just stayed silent and seated

Yuta: "Hey, Satoru, is that your little brother?" Satoru: "Yeah... Maki, and Nobara! Stop chasing MatthewX!"

Maki: "MatthewX!" Nobara: "MatthewX!"*

*As you heard a knock on the door you ran and opened the door only to see Satoru's girlfriend who is now your sister-in-law as her name was Avalynn

Yuji & Choso Both gave her a nod of respect and went back to their conversation

Nanami, Todo, and Hakari were gambling in the other room when they saw Avalynn in the corner of their eyes and they both waved and smiled before going back to gambling

Nobara & Maki were watching a movie when they saw Avalynn they both paused the movie and greeted him by saying Hi or Welcome

Inumaki And Geto were in the kitchen cooking food and deserts for the others and they heard you open the door they stopped cooking and they both looked up to the door and saw Avalynn as they both waved and then went back to cooking