Here are the triplets from left to right: Elan, Kami, Elmi. They are the children of Eldon and Yami. So Kami comes back home with his new hair style (dyed black with red) and his brothers are laughing because his hair style is similar to Yami's. Kami punched Elmi in the arm, but he kept laughing. Unlike Elan and Elmi, Kami can bear children, like Yami can, so he's closer to Yami than this brothers are.