Alvin married Katherine D. Allen on 3 Jan 1860. Katherine (daughter of Hiram C. Allen and Nancy Maria House) was born on 22 Jul 1842 in Williamstown, Oswego, New York, USA; died on 27 May 1903 in Clare, Clare, Michigan, USA; was buried in Clare, Clare, Michigan, USA. [Group Sheet] [Family Chart]

1. Lincoln H. Root was born on 22 Dec 1860 in Michigan, USA; died before 1880.
2. Ida Root was born on 21 Dec 1862 in Michigan, USA; died on 11 Feb 1879 in Sheridan Township, Clare, Michigan, USA.
3. Burt Allen Root was born on 11 Oct 1866 in Osceola, Michigan, USA; died on 27 Feb 1929 in Hersey, Osceola, Michigan, USA; was buried in Hersey, Osceola, Michigan, USA.
4. Lola Viola Root was born on 19 Dec 1869 in Hillsdale, Hillsdale, Michigan, USA; died on 15 Jan 1968 in Clare, Clare, Michigan, USA.
5. Louis Dudley Root was born on 16 Oct 1873 in Milan, Washtenaw, Michigan, USA; died on 7 Oct 1930 in Duluth, Saint Louis, Minnesota, USA; was buried in Duluth, Saint Louis, Minnesota, USA.
6. Nancy Mary Root was born on 14 Feb 1876 in Michigan, USA; died on 8 Jul 1940 in Saginaw, Saginaw, Michigan, USA; was buried in Flint, Genesee, Michigan, USA.
7. Hattie Maud Root was born on 13 Dec 1878 in Sheridan Township, Clare, Michigan, USA; died on 4 Aug 1935 in Hill City, Aitkin, Minnesota, USA.
8. Alvin Lucius Root was born on 25 Jun 1880 in Sheridan Township, Clare, Michigan, USA; died on 25 Apr 1945 in Duluth, Saint Louis, Minnesota, USA.
9. Leon Stanley Root was born on 7 Jul 1883 in Sheridan Township, Clare, Michigan, USA; died on 25 Jul 1950 in Cheyboygan, Cheboygan, Michigan, USA; was buried in Wolverine, Cheboygan, Michigan, USA.
10. Carl Root was born on 20 May 1884 in Sheridan Township, Clare, Michigan, USA.
11. Ivan Otto Root was born on 4 Jul 1885 in Sheridan Township, Clare, Michigan, USA.
12. Iva Imogene Root was born on 16 Dec 1889 in Sheridan Township, Clare, Michigan, USA; died on 30 Oct 1920 in Flint, Genesee, Michigan, USA.