Lines of succesion

Arendelle
Current monarch: Queen Elsa

Corona
Current monarch: King Frederic and Queen Arianna

Northern Mountains
Current ruler: Grand Pabbie

The Southern Isles
Current monarch: King George of the Southern Isles Prince Rudi of the Southern Isles (13th in line), Prince Runo of the Southern Isles (14th in line) and Prince Hans of the Southern Isles (19th in line) were all banished and cut off from the list of succesion.