Ross Kemp broke down in tears as he unearthed a family secret that he spent his whole life questioning on Tuesday's episode of Who Do You Think You Are? The actor, 60, is one of the stars taking part in the latest series of the genealogy documentary series. During his time on the show Ross was on a mission to find out about his mum's side, including his great-grandad, who was known in the clan as Pop, who had 10 other siblings and lived in a pub in Portsmouth as a youngster.