Beryl Grace

Ms. Grace was briefly the lover of Zeus, and the mother of Thalia and Jason Grace. Thalia described her as being an alcoholic.

History
Ms. Grace dated Zeus during the eighties, when she was a TV starlet with a "big poofy eighties hairdo." Their relationship resulted in the birth of Thalia. She is the only mortal to have a child from both aspects of a god (Greek and Roman) that we know of so far in the series.

Seven years after Thalia Grace was born, Ms. Grace gave birth to a son by Zeus (This time in his Roman form; Jupiter) named Jason. Ms. Grace noticed that he was much more formal, making her fall in love with him all over again. She didn't know that he was in his Roman aspect.

Two years later, Jason was offered to Hera by Ms. Grace during a family picnic. Thalia, who went to get the picnic basket, came back to see Jason gone and her mom crying. Thalia tried to find him, but was dragged away by her mom. Her mom said Hera had claimed Jason and that he was as good as dead. Thalia later called the cops on her mom.

Zeus told Ms. Grace that he was a god, and she thought she had achieved the impossible, for "wooing" the king of all gods. But when Zeus left her to go to Mount Olympus, she developed a drinking problem, which grew progressively worse over time, ultimately resulting in a car accident that took her life, two years before Thalia was awakened from her tree by the Golden Fleece.

The Demigod Files
Ms. Grace appears in The Demigod Files, but only by appearance. Thalia, Percy, and Nico are in the Underworld on a mission for Persephone to recover Hades' stolen sword.

Melinoe appeared to Thalia as Ms. Grace, yelling at her for abandoning her. Thalia was shocked by this, and protested that her mom had abandoned her. Percy manages to destroy the illusion by out smarting it, and Thalia is very shaken up from the experience.

The Lost Hero
When Thalia is reunited with Jason, she explains what happened the day he disappeared and mentions the reasons she ran away from her mother. She also tells him how she died two years before Thalia was awoken.

Appearance
She is described as being a tall, beautiful woman with a big poofy eighties blonde hairdo and blue eyes.