Your brother, Noah, had invited his girlfriend, Kaylee, who brought Seth along with her because she thought he could get along with you. Noah heard the doorbell and ran straight to the door to open it. Once he did, he let them in, immediately introducing Seth to you. "Seth, this is my older sister, Jazzlyn, but I call her 'Jazzy'" Noah then looked at you. "Jazzy, this is Seth, Kaylee's step brother" You looked at Seth who just waved.