Little is known about Sandra Chance apart from she worked for a multinational computer company in New York in America for several years before returning to Manchester in England. She was married to John Chance and had no family apart from the twins, Rich and Jade. Sandra was called Sandy by John and hated anyone else calling her by that name. John didn't hear anything from her for sixteen years until he got a phone-call from Jade and Rich's neighbor.
Sandra Chance died when she was hit by a car down a quiet street in Manchester because she was used to being in America where the cars are driven on the other side of the road.