Hi, My 3X great grandmother is the Martha Taylor listed as living with the Griffin family in the 1850 Martin Co. NC Census. She and her 2 siblings were orphans and I do not know her relation to the Griffins or the Harrells. BUT...the female Harrell is listed as being 40 years old in 1850. If she gave birth in 1878, that would be highly unusual. I don't think these are the Harrells that you are looking for. Good luck with your search.