I have been looking again at Susannah Kingwell and family and think it even more likely that they are related to my Thomas Kingwell. The shared family names are very suspicious. Susannah's brother, Jonas, had a son named Joseph and a relative named Lavinia (visiting in 1851 census). Jonas and Mary moved from Cornwall to Plymouth, as did some of my Kingwells. My Thomas Kingwell had a son named Joseph, who had a daughter called Edith Lavinia. Susannah's parents were Thomas and Sarah; his wife ?Mary John's parents were Richard and Catherine. These are all names that crop up over and over again down the generations. I shall do some more research and see what I come up with.