Grandsanta is the 136-year-old father of Malcolm "Santa" Claus, the father-in-law of Margaret, the grandfather of Arthur and Steve, the previous Santa before Malcolm and the deuteragonist of the 2011 film, Arthur Christmas.

He dislikes how delivering presents has changed since his time as Santa and believes that he could do a better job the traditional way.

He along with Arthur, Bryony and his pet reindeer travel via his old sleigh Eve (pulled by the great-great-grandchildren of the original eight reindeer) to deliver a bike to a young girl named Gwen after it is forgotten by accident.

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