Kieran Culkin is down to bring his real-life family into his one! ET's Rachel Smith spoke to the 39-year-old actor at the season 3 premiere of the HBO series, and he revealed that he'd love to welcome one or more of his siblings into the world of the Roys.Kieran is brother to star Macaulay Culkin, 41, and also has siblings Shane, 45, Quinn, 36, Christian, 34, and Rory, 32.