I am afraid we cannot help you on the parents of Cynthia Bennett.I also don't know that we can help determine which 1870 and 1880 family in Hancock Co. is the family of this Martha Bennett.Our census extractions show the following two families in Hancock Co. in 1870.I am sorry but I don't have the page numbers, etc.: 1)W. ALFORD38 MMS Martha27 FMS Leonard4 MMS Adolphus1 MMS 2) Wm. ALFORD 36 MMS Martha30 FMS
I do not know which of these two couples is Wm. B. and Martha Bennett. These names of children do not match those you have in 1880 but we do not have any extractions for Hancock in 1880 so I cannot check that. To further complicate things,We have the marriage of a Wm. B. Alford to Martha Doss in 1883, Hancock Co. MS.