Natalie Chase

Magnus's mother was the sister of Fredrick and Randolph Chase, the mother of Magnus Chase and the aunt of Annabeth Chase.

History
When Magnus was six, his mother got into an argument with her brother's which resulted in her falling out with them and told Magnus to keep away from them. Eight years later, when Magnus was fourteen, his mother was killed by something with glowing blue eyes and since then Magnus has been living on the streets.