Tsurara is a Snow Fairy(yuki-onna) that lives on the Mount Fuji of Airan Island. She is also the mother of Michiru.
Tsurara's Daughter: Michiru
Tsurara has a single daughter, Michiru. At some point in her near eternal life she fell in love with a human mortal on Airan Island. Tsurara lives on the Mount Fuji of Airan Island and rarely leaves. She often struggles to get her daughter to come and visit her much.
Due to Michiru's half yuki-onna body, she has difficulty dealing with the warmer temperatures of the island. This was mistaken as her being unhealthy. Due to her lack of involvement in the village, Michiru is often forgotten about.
The father of Tsurara's daughter was a direct decedent of Obaba of Airan Island. Since Obaba is over a 130 years old. It's unclear if he was her son, grandson, or great grandson.