Some content in this article is derived from information featured in Harry Potter and the Cursed Child , and, as such, spoilers will be present. Keep calm and keep the secrets !
Dean Thomas (b. 1979 / 1980 ) is a half-blood wizard, the son of a wizard and a Muggle .  When Dean Thomas was very young, his father died and his mother married another man , giving Dean several half-siblings .  Since Dean's father never told his mother that he was a wizard, and was eventually murdered by Death Eaters when he refused to join them, Dean grew up thinking he was Muggle-born .  Dean was a Gryffindor student at Hogwarts School of Witchcraft and Wizardry and played as a Chaser for their Quidditch team for a time.