Olive Gray is an English actor, known for portraying Mia Stone in the children's television series Half-Moon Investigations and as Dr Miranda Keyes in the television series Halo in 2022. Gray is the eldest child of Fame Academy judges and singers David and Carrie Grant. Gray has three siblings, Tylan, Arlo, and Nathan. Gray has ADHD, which was diagnosed in their teenage years, and their siblings also have learning difficulties. Gray studied at Queenswood School, Hertfordshire and then moved to s ...