Gampy

"Gampy" is a character mentioned in Granny's Diary in during the Final Day.

Biography
Gampy was Granny's late husband and the father of Tortus. The Diary mentions that Granny, Anju, and Anju's Mother will be taking refuge at Romani Ranch, and goes on to say that she will take several of Gampy's favorite books along with her.

Etymology
The Japanese text refers to Gampy simply as "grandfather". Gampy is likewise derived from Grandpa.