Dennis married Mary Louise Hulse on 5 Aug 1870 in Calverton, Riverhead, Suffolk, New York, United States. Mary (daughter of Daniel Harrison Hulse and Esther Robinson) was born on 26 May 1849 in Calverton, Riverhead, Suffolk, New York, United States; died on 12 Mar 1916 in Eastport, Brookhaven, Suffolk, New York, United States; was buried in Eastport Cemetery, Eastport, Brookhaven, Suffolk, New York, United States. [Group Sheet] [Family Chart]