Grandma Chase is the mother of Randolph, Natalie and Frederick Chase, grandmother of Annabeth, Magnus, Aubrey, Bobby, Emma and Matthew Chase, and the wife of Grandpa Chase.
History
Grandma Chase married a man and had two sons and a daughter with him. She and her family lived in a brownstone mansion in Boston. She died before meeting her grandchildren.
Magnus Chase and the Gods of Asgard
The Ship of the Dead
Magnus finds a picture of her and her husband in the library of the family mansion.