Caroline Chase

Caroline Chase is the wife of Randolph Chase, the mother of Emma and Aubrey Chase, and the aunt of Annabeth Chase and Magnus Chase.

The Hammer of Thor
Caroline appears in a flashback when she and her daughters accompany Randolph on finding The Sword of Summer in the Massachusets Bay.

Unfortunately, their yacht was caught in a freak tempest, causing the boat to roll starboard and drowning her and her daughters.