Talk:Wonderbolts Academy/@comment-16424758-20121111051913/@comment-4950186-20121111083820

No necessarily, I've seen some fiction works where the rivalry is formed from the beginning, though if they are sisters that knowing each other could mean they have a sibling rivalry if they are somehow related. (Hopefully Hasbro gives Rainbow or Fluttershy a sibling because only Twilight, Rarity, Pinkie and Applejack have been shown to have biological siblings, and none of them are Pegasi meaning we have no known Pegasi relations in the Mane Six.)