The "DEAD" Return Home Ivar x Reader

Y/N is the long lost thought to be 'deceased' daughter of Floki and Helga. She was actually kidnapped on the order's of King Aelle and raised by him. He wanted to punish Ragnar in a personal way and thought the best way was by stealing something precious to Ragnar and making him believe that it had met a gruesome end. However, Aelle never took into consideration that the very act he committed would come back around to lead to his downfall.

How will Ragnar's sons react when they find out who Y/N really is? Will they even remember her? And what about Floki? How will he handle discovering that his first born daughter is still alive?

But what about Ivar? Whom Y/N always was kind and sweet towards when they were children before she had been stolen. How will Ivar react to the discovery that she is alive?