When Garrett Baxter Null was born on 1 February 1839, in Warren, Missouri, United States, his father, John S Null, was 32 and his mother, Eliza M Baxter, was 22. He married Areander Mary Arkansas Bowen on 25 April 1861, in Warren, Missouri, United States. They were the parents of at least 1 son and 3 daughters. He lived in Bedford Township, Lincoln, Missouri, United States in 1860 and Salt River Township, Audrain, Missouri, United States in 1900. He died on 10 June 1927, in Mexico, Audrain, Missouri, United States, at the age of 88, and was buried in Elmwood Cemetery, Salt River Township, Audrain, Missouri, United States.