Billy's Grandma is or was the unnamed paternal grandmother of Billy and mother of Harold who in appeared in the TV movie Billy & Mandy's Big Boogey Adventure.
History[]
Billy dresses up as Little Red Riding Hood to go visit her for the day in A Grim Day.
She debuts in Billy & Mandy's Big Boogey Adventure, where she is seen waving at Billy when he, Grim, Irwin, and Mandy were making their way up the Isle of Peril to capture Horror's Hand Billy states "I know! I can see my grandma's house from here" and saying "I'll never understand why she moved here". She lives on an island in the Underworld its unclear how she moved there, though its possible that she asked her son to move here there with the help of Grim. It could also be said that she died as Grim one said "I'll be visiting her soon enough" and now lives in the Underworld.
Appearance[]
Billy's Grandma has the same large pink nose and "dot" eyes like Harold Billy and Darold do. She has gray hair wrapped up in a bun she wears a orange and white dress she also wears red lipstick.
Grandma's House as it appears in Billy & Mandy's Big Boogey Adventure