* The Father: A resourceful and determined Swiss man who leads his family.
* The Mother: A loving and capable woman who helps keep the family together.
* Fritz: The eldest son, strong and adventurous.
* Ernest: The middle son, kind and thoughtful.
* Franz: The youngest son, mischievous and playful.
* The Family Dog: A loyal and protective companion.
There are other characters that appear in the book as well, such as the natives they encounter on the island.
It's possible you are thinking of a different book or a character from a different adaptation of the story.