Pat, The Charlotte SAWFORD of Knotting was born 1807. This would make her 34 years younger than William COX based on his age in 1851. The first question is :- Are you sure you have the correct marriage ? If you get Charlotte's parents, you can use them for a parent search on IGI to find her brothers and sisters. I would suggest that Elizabeth is a wife of a brother to Charlotte. You might be able to find them in an earlier census or pick up their marriage on IGI or FreeBMD. Similarly, you should be able to find Mary DANIELS in 1871 Census with parents or her birth on FreeBMD. I would also suggest a check of Surname Message Boards and Family Trees at Rootsweb. Peter