Olive Gray (actress)  Olive Gray (formerly Olivia Gray, born Olivia Grant, 16 December 1994 in London, England) is an English actress best known for portraying Mia Stone in the children's television series "Half-Moon Investigations" based on the book by Eoin Colfer in 2009. Gray is the eldest child of "Fame Academy" judges and singers David and Carrie Grant. Gray has two sisters, Talia and Imogen, and an adopted brother, Nathan. Gray has ADHD, which was diagnosed in their teenage years, and their siblings also have learning difficulties. Gray studied drama at Guildhall School of Music and Drama, graduating in 2016. Gray is non-binary and uses they/them pronouns. In 2005, they made their debut acting appearance in the popular television series "The Story of Tracy Beaker" as Alice. In 2007 and 2008 they appeared in "EastEnders" as Bernadette Logan, a girl who bullied Abi Branning (Lorna Fitzgerald). In 2009, they made a major appearance, portraying Mia Stone in the TV series of "Half Moon Investigations". In 2016, Grant played a Yoga Girl in BBC's "Fleabag". They appeared in an episode of the sitcom "Uncle" in 2017 as Anna.