When William Napoleon Fillion was born in November 1883, in Wisconsin, United States, his father, John Fillion, was 27 and his mother, Victoria Tromblay, was 29. He married Mabel Cotton on 26 December 1904. They were the parents of at least 2 sons and 2 daughters. He lived in Atlanta, Rusk, Wisconsin, United States for about 5 years and Murry, Rusk, Wisconsin, United States for about 20 years. He died on 8 May 1964, at the age of 80, and was buried in Bruce, Rusk, Wisconsin, United States.