Let me guess, Anna and Elsa’s mother would be Mitchell’s other sister? Guess to explain if Elsa’s snow powers are genetic.
Yup, I reckon Snow Queen is their Aunt, their mother was the youngest sister who went off and married into Arendelle royalty. The sea journey they died on, they were going to find her sister for help with Elsa who had inherited the family magic. Older blonde sister with magic and younger brunette sister who suffered because of it, history repeating and whatnot, (I thought that before we got the “three sisters” information, so now just adding on that the oldest sister dies so MitchellInTheMiddle became Snow Queen, the whole sister-inheriting-the-kingdom thing is in keeping with the movie).
Makes a lot of sense. And maybe Anna/Elsa’s Mom and the Snow Queen got in a fight over the cause of their sister’s death?