lol ya totally, mayb a brother so that she doesnt hav to deal with an older sis if she isnt anything close to how max is haha. an older bro wud b better cuz he wud b more protective of her and stuff like that lol as for the jeb thing..make it a slow painful death yes? XD
I once thought about writing a fanfiction like that. Basically that sibling in the back-up plan for saving the world (in case Max died and couldn't come back to life or something), but Jeb didn't think they were nessisary and ordered that they should be put down. However, that birdkid, ends ups growing up a more normal version of Max's life with a flock of their own. When Max and her flock start getting attention, the other group leaves their semi-normal lives to find out why they were created and seek their true purpose. This sibling decides to save the world their own way, without those perfectionist scientists who are trying to control Max.