A. John and his sister Nancy and two children of his deceased sister Elizabeth are on the 1880 census.

1880 US census St. Clair, Columbiana, Ohio, p 629:

John MONTGOMERY Self S Male W 34 OH Farmer PA OH
Nancy MONTGOMERY Sister S Female W 39 OH Keeping House PA OH
Albert MCCOY Nephew S Male W 17 OH Farm Worker OH OH
Belle MCCOY Niece S Female W 15 OH Keeping House OH OH
Julia SLAUGHFMAN FHMAN Other S Female W 30 OH Housekeeper GER GER

--------------------------------------------------------------------------------
Source Information:
Census Place St. Clair, Columbiana, Ohio
Family History Library Film 1255002
NA Film Number T9-1002
Page Number 629B


B. There were no children as of 1905.