When Dennis Wilson was born on 16 March 1818, in Colrain, Franklin, Massachusetts, United States, his father, David Wilson Jr, was 40 and his mother, Betsey Holland, was 35. He married Sarah Ann Wilson on 19 October 1841, in Colrain, Franklin, Massachusetts, United States. They were the parents of at least 1 son and 3 daughters. He died on 19 June 1899, in Colrain, Franklin, Massachusetts, United States, at the age of 81, and was buried in North River Cemetery, Colrain, Franklin, Massachusetts, United States.