Board Thread:Spoilers!/@comment-2153169-20140908192157/@comment-9241531-20141009165728

Hmcooper4 wrote: I think that the way I read that is that anything that is truly considered as canon from Frozen is set, and won't be twisted. So the fact that the King and Queen RAISED Anna and Elsa can not be changed. But, there was nothing ever definitive said about whether the King and Queen were the Natural Parents or not.

^This.