There were 4 years between John (Apr. 1870) and your Clarence Albert (1874).I would guess that the 7th child was born 1872 but died before 1880.No marked grave to confirm this supposition.
There was another Green family in the same neighborhood as Seneca & Nancy.This was Daniel & Angeline.Looks like his first wife was Rachel Etter, m. 1 Oct. 1829, Montgomery Co. Ohio.Rachel d. 13 Nov. 1840, 30Y, buried in Ergenbright Cemetery, one of the Atterbury Cemeteries that were moved to Johnson Co.Daniel m. Angeline Spurgeon 18 Mar. 1842.Daniel d. 5 Apr. 1862, 52Y 1M.Angeline d. 15 Feb. 1901, 78Y.Rachel, Daniel, Angeline, and a son, Usual Green (d. 14 July 1909, 57Y) all have markers at Ergenbright.I should add that Usual ALSO has a marker at Rest Haven at Edinburgh (d. 21 July 1909).Presume he was moved; don't know why date of death is different.
It seems reasonable to suppose that Seneca & Nancy Green and any infant of Henry & Jane are probably also buried in the Erganbright group; but there are no known markers to confirm this.Perhaps a Bible record will turn up?
When did Henry Green die?I'd also like to have dates on you Clarence Albert, for my files.Thanks!