In December 2016, Cheryl appeared on the BBC One genealogy series "Who Do You Think You Are?", during which she researched her maternal family. Research shows that her paternal line is from Tyneside and that there were a number of coal miners amongst Cheryl's forebears. When tracing further back, in one of the branches of her paternal line, researchers find that her ancestry includes several mariners. The investigation into Cheryl's maternal line shows that her grandmother, Olga Ridley, was one of twin girls born to Edith Annie Burton, the housekeeper for a widower named Joseph Ridley who already had a number of children from his marriage. Joseph Ridley had fought in World War I in the Durham Light Infantry as a Pioneer in France and, from an examination of the census, before the war he had been a grocery warehouseman.