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Film Theory: Disney's FROZEN - Anna and Elsa Are NOT SISTERS?!
Frozen Originally Positioned Elsa and Anna as Enemies—Not Sisters
Anna, The Disney Princess Roleplay Wiki
Anna, Frozen Wiki
Anna and Elsa Almost Weren't Sisters in 'Frozen' - Inside the Magic
Disney Theory about 'Frozen' Movie Just Blew My Mind - PureWow
Elsa, Disney Wiki
Why does Elsa get ice powers but not Anna? - Quora
Elsa, Frozen Wiki
Frozen Originally Positioned Elsa and Anna as Enemies—Not Sisters