Dennis McGrath McGraw Ireland to Vermont

Hi! I am looking for information about Dennis Mcgrath b. 1840 Ireland and who died in 18 Jan 1902 Castleton, Vermont. He may have lived in New York for a while because he married a Fanny (Delia) Putnam who was born (1845) and raised in Cold Brook, Herkimer, New York. She and Dennis lived in and around Castleton, Vermont. They had 5 children:

Thomas b.3 Sept 1864 Castleton, VT

James b. 1865 Castleton, VT

George b.18 March 1867 Castleton, VT

and twins

Dennis and Mary b.8 March 1870 Poultney, VT

Dennis Jr. died 10 days after his birth. Thomas and James died young and I don't know what happened to George. Fanny died in 19 Dec 1886 Castleton, Vermont. I think I may have found a naturization record that says Dennis was from Limerick, Ireland. I know he had some brothers. My father-in-law said that they donated the money for the windows at the catholic church in the area. Any help would be appreciated! Thanks, Dana