Hi Kathryn I have been checking all our records and can not find a Sarah Bartleman born 1831 anywhere! She could have married a bartleman, and then remarried! I doubt if she is from George's family as he was not married till 1851 in Marylebone. William & Susan got married in 1825 at st Brides Feet street, and they lived in Chelsea. They were at 17 North street, Chelsea in the 1841 census, but there is no Sarah.I would be interested in seing the birth certificate you have. I will see what more I can find out, as this has my interest now. One thing, for same unknown reason all the Bartleman's from our family were not baptised from 1806 to 1825 except one Eleanor who died the following year!!