 Grandma Thora lives in a house not too far from Arthur's in Elwood City and is known to be a bad cook, but a loving grandmother and a world-class marbles player.She loves to play bingo every Friday night, and in some episodes has to watch over Arthur and D.W. She is good friends with Mrs. McGrady, the school cafeteria monitor.Grandpa Dave lives on a farm he claims has been in the family for 150 years.