I think McNeil cemetery is now known as Enon cemetery. It is on the old stage road in Monroe County, about 7 miles east of Uriah.
There is not a marker for Cape Smith. There is a marker for William Mills Grisset, who would have been Mary Jane's father.
I suspect Cape was buried in the Grisset plot, since they were both grandparents to Delia and Charles.
There are many McNeils in the cemetery, and it is only about 2 miles NE of where the McNeil community was in 1916.