<br /> Rupert Grint has joined the cast of the untitled thriller series from M. Night Shyamalan at Apple.<br />According to SFGate, the “Harry Potter” alum will play the younger brother of “Six Feet Under” star Lauren Ambrose.<br />Apple has shared that Ambrose’s character will be a mother named Dorothy, and “Game of Thrones” alum Nell Tiger Free will play Leanne, a nanny.<br />According to TheWrap, the show is created by Tony Basgallop, who will write and executive produce. <br />
