Ashfield John Gray abt 1851-1919

Carrie Gray's father was Ashfield Gray.  This man is one of several  mysteries that I have been trying for years to solve.  I have estimated his birth date based on census records and his death based on a plaque in the Canaan Corners cemetery.   Here is the little i have pieced together.
The first record for Ashfield is in the 1860 census.  He is listed as 8 years old, living with his parents, Abel & Phebe Gray, in Canaan, Wayne County, PA.  His brothers, Charles, Caleb, & Daniel, and a sister, Ida, are also listed.  In the 1870 census he is listed as John A. Gray, still living with his parents and working on the farm.  The only sibling shown is a sister Fanny E., who appears to have been born around 1861.
According to a notice in the Honesdale Citizen on July 26, 1877, he married Della Seely on July 22, 1877 at the Methodist Protestant parsonage in South Canaan.  The Rev.  M. Berriman presided.  The 1880 census shows John A. & Della Gray living in Fell, Lackawanna, Pennsylvania with 2 children, my grandmother Carrie age 1 and her brother Alfred, 4 months old.  His occupation is listed as farm laborer.

The 1890 Scranton, Pennsylvania Directories lists Ashfield as a laborer living at 181 Belmont Street in Carbondale.  By 1900, the family had moved to Plains Township near Wilkes Barre.  The census listing is incorrect.  His name is spelled Eshfield and Della is listed as Isabella.   Carrie had already moved to lived with her grandfather by this time, but the 2 younger children, Alfred and Isabella are shown.  The 1910 census listed John as a fireman in Parsons, Luzerne, PA, with Della as the head of the household and only Alfred remaining with his parents.  The Wilkes-Barre City DIrectory for 1917 & 1918 list Ashfield J. Gray as an engineer living at 423 Hollenbeck Ave, Parsons. In the 1920 census, Della is shown as a widow.

I have only 2 clues to Ashfield's death.  One is a small green marker I found in the Canaan Corners Cemetery, in Waymart, PA, with his name, birth and death years (shown here).

The other is a story my father told me, that his grandfather died in a "buggy accicent"  I have found no other evidence of this, but I am continuing my search.