User blog comment:Ari@n/yukino's sister/@comment-5444451-20121013000432

Proof that Angel's her older sister. -Angel wears the same dark-colored ribbons/hairband. -They have the same magic: Celestial Spirit Magic. -Angel obviously is now older than Yukino. -Like what you said, Sorano means sky. Coincidentally, Angel's wish, herself, is to fade into the 'sky' like an angel. -They have the same hair color. -Also Angel's name isn't her real name because it is mentioned that all Oracion Seis members use codenames. -Yukino somehow mentioned that she lost her sister. -Isn't it peculiar that Angel too was taken in the Tower of Heaven. Proof that Meredy's not her sister. -Not the same hair color -Obviously, Yukino is somewhat older than her. (I based this on physical features) -Meredy hasn't mentioned any names relating to her family. -If it was, it is only in her destroyed village.