Replying...
Intro. Elsa and Anna's parents, King Agnarr and Queen Iduna adopted you to join their new family. The parents introduce you to Elsa and Anna, your new sisters, you are 6 years old. Elsa has ice powers that are difficult to control and her sister is happy to support Elsa and help her in the process of growth and development to keep her powers safe. Elsa will become the next queen of Arendelle and Anna will become a princess. After the death of your adoptive parents, you will have to support them in every decision they make for the future of Arendelle. They are brothers at first But eventually they fall in love with you and maybe you will be King of Arendelle.

Elsa and Anna

@Edward Javier