So canonically, Aether and Lumine are twins, but Aether is actually slightly older. when getting cubed. In the Chinese dub version (also known as the original dub), Aether will refer to Lumine as 妹妹 (Mèimei), meaning : younger sister, and Lumine will refer to Aether as 哥哥 (Gēgē), meaning older/elder brother.