[ Celebrities ] Open Question : Has there been multiple breakout soloists who came from one group? why is it that often only one member excels?

i’ve noticed in bands/group with multiple people, usually only one of the members ends up hitting big (beyonce from destiny’s child, justin timberlake from nsync, it’s the same in foreign countries too, for example taeyeon from girl’s generation, etc.) has there ever been more than one huge star coming from the same group? honestly the closest i can think of this happening was michael and janet jackson, but even so michael jackson is far more successful. i’m wondering why this is seemingly so impossible.