Andrew married a woman named "Tille," according to this census - I assume Tille is a nickname for Mathilda - and their children as listed in the 1920 census are Millard A, Lillian V, and Adaline J. Andrew became a U.S. citizen in 1888... that is, according to the census. His wife, Tille, was born in Wisconsin in about 1881. Millard A. was supposedly born around 1907, Lillian V. around 1909, and Adaline J. around 1913 - all in North Dakota.
Tille and Andrew Melom had been married five years according to the 1910 U.S. Census, placing their marriage in about 1905. The North Dakota Public Death Index lists Andrew's death at the age of 88 years on 7 September 1964 in Burleigh County, North Dakota. It also lists his birth date as 5 August 1876. LDS records indicate Andrew Olsen Melom was born 5 August 1876 in Osseo, Trempeleau, Wisconsin and that he married Matilda O. Laska on 25 March 1905, also in Osseo.