Family Tree follows the world and journey of 30-year-old Tom Chadwick (Chris O’Dowd). Having recently lost his job and girlfriend, Tom has a rather unsure sense of his own identity. But when he inherits a mysterious box of belongings from a great aunt that he never met, he starts investigating his family lineage and uncovers a whole world of unusual stories and characters and a growing sense of who he is and who his real family are.

Family Tree will be a single-camera, improvisational, documentary-style comedy, a style that Christopher Guest's films have pioneered.