Ging and Mito's Grandmother

Abe is Ging and Mito's grandmother, she lives on Whale Island.

Hunter Exam arc
During the events on where Gon was embarking to a journey to become a Hunter, she was enlightening Mito about how Gon is exactly has the blood of Ging and expects that one day he will leave his home just like other men do.

Yorknew City arc
Later after Gon and Killua return to Whale Island from the Heavens Arena to visit Mito, she tells him about the deaths of Mito's parents and Ging's father. According to her, Ging wanted her to take care of Gon for a while, but before she could say yes, Mito shouted that she would not allow Gon to be in Ging's care and later took the guardianship of Gon away from him.

Dark Continent Expedition arc
She greets Gon when he returns to Whale Island along with Mito and is seen later on having dinner with them.

Trivia

 * Mito and Ging's grandmother's name was never mentioned in the manga and both anime adaptations, but was revealed to be "Abe" in the booklet of the first Bluray Volume of the 2011 anime.