can siblings join different sororities

[whitechocolate]

My sister is a member of a different sorority than the one I would like to pledge... she has always been a role model for me and I dont want to hurt her and the rest of her friends who expect me to pledge that certain sorority...My question is can siblings be in different sororities? Or is there a rule that doesnt allow it... I would ask members from my college but I dont want to jeopardize my chances of getting into the sorority of my choice if it isnt allowed...