Twins of Artemis

Tirian and Tirias were both 16 when they were taken to Camp Half-Blood. Their father died because of cancer when they were 6. Tirian has the ability to heal like an Apollo kid and is able to hunt like Artemis. Tirias is kind of like her sister (Tirian) but can also control animals. What will happen when Zeus finds out Artemis had children?

Sorry, i'm terrible at descriptions.