Hi Kathryn As far as we know William & Susan had 8 Children, but they did not have a Sarah. George (1827) was the oldest son and he married Jane Esther O'Keeffe, and they had a Sarah b.1858. The only other Sarah near this time is 1850.
I could not find any Sarah living with John & Mary Ann Bartleman in the 1861 census, though their niece Emily (14) was.Have you any more details about this Sarah Bartleman ? If you can send me any more information, we will do what we can to help you. John & Richard Bartleman