"George's grandmother" is not an official name.
George's grandmother is the grandmother of George Lundgren and George's unnamed sister and the mother or mother-in-law to Neal Lundgren and Mrs. Lundgren. She makes an appearance in Arthur's Perfect Christmas special where she is seen in the Lundgren house dancing with Neal Lundgren. She seems to look like an older version of Mrs. Lundgren meaning she might be her mother.

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