well, I have to admit to being totally confused now!
The family I have is: Felix HENDREN (abt 1760-1838) married Anne HAWKESFORD (1764-)
George (-1833), married Maria Ann MAYFIELD (but strangely, listed in marriage on IGI as Charles; all other times George) John (1790-) Joseph William (1791-1866) - Became a Catholic Bishop Mary Theresa (1794-1868) - Unmarried, became a teacher Lucy (1796-1867) - married John BAILEY Felix Xavier (1798-1878) married Ann KING Edward (1803-1839) married Mary TOWNSEND
So I have 7 children, not eight. I'm in contact with a few other researchers, and we all have the same seven.
So who is Sarah? I have never come across her. I would not be surprised if there are other children, though. What do you have tying Sarah to parents Felix and Anne?
Drop me a mail and I can give you a link to my tree on Ancestry.