(In this Au you, Percy, Tyson and Estelle are all demigods. Estelle isn't a mortal and Tyson isn't a Cyclops.)

You, Percy, Annabeth, Grover, Juniper, Leo, Jason, Piper, Thaila, Reyna, will, Nico, Tyson and Estelle are all going to Hogwarts.

This takes place in fifth year so pretty much everyone is about fifteen.

Percy: “So this is the train huh?” He stepped through a brick while with his little sister and his younger brother who is half blind.

Annabeth: “I guess so.” She was holding Percy's hand.

Harry: “Oh!! You guys must be new students!” The boy with a lightning scar on his head asked.

Reyna: “Yeah.” She has her two dogs in leashes.

Hermione: “Those must be your familiars!” She was holding her ginger cat, Crookshakes.

Ron: “You call all sit with us.” He said to the Greeks and Romans.