When Moses Washington Gibson Sr was born on 21 January 1840, in Monroe, Mississippi, United States, his father, George Washington Gibson, was 39 and his mother, Mary Ann Sparks, was 37. He married Electa Ann Badger on 30 January 1871, in Salt Lake City, Salt Lake, Utah, United States. They were the parents of at least 3 sons and 2 daughters. He lived in Salt Lake, Utah, United States for about 10 years. He registered for military service in 1906. He died on 14 February 1912, in Saint Thomas, Clark, Nevada, United States, at the age of 72, and was buried in Logandale, Clark, Nevada, United States.