| Father | Male Cornelius William Martens |
| Born | 21 Jan 1860 | DePere, Brown Co, Wisconsin |
| Died | 09 Dec 1947 | Minneapolis, Hennepin Co, Minnesota |
| Buried | ||
| Married | 08 Feb 1888 | Big Stone City, Grant Co, South Dakota |
| Father | John Martens | F55780 Group Sheet | |
| Mother | Theodora Tillemans | F55780 Group Sheet | |
| Mother | Female Mary Jane Walsh |
| Born | 06 Jul 1860 | Minnesota |
| Died | 04 Jul 1954 | San Mateo, San Mateo Co, California |
| Buried | ||
| Father | ||
| Mother | ||
| Child 1 | Male William James Martens |
| Born | 19 Jan 1889 | Milbank, Grant Co, South Dakota |
| Died | 04 Jun 1965 | Vancouver, Clark Co, Washington |
| Buried | ||
| Spouse | Rose Merle Hendry | F192457 | |
| Married | ||
| Child 2 | Male Joseph Walter Martens |
| Born | 19 Jan 1889 | Milbank, Grant Co, South Dakota |
| Died | 1899 | Milbank, Grant Co, South Dakota |
| Buried |
| Child 3 | Female Winnifred Theodora Martens |
| Born | 21 Oct 1890 | Milbank, Grant Co, South Dakota |
| Died | ||
| Buried |
| Child 4 | Male Francis Mark Martens |
| Born | 25 Apr 1892 | Milbank, Grant Co, South Dakota |
| Died | 31 Oct 1969 | Ontario, San Bernardino Co, California |
| Buried |
| Child 5 | Female Margaret Mary Martens |
| Born | 05 Nov 1893 | Milbank, Grant Co, South Dakota |
| Died | 19 Dec 1991 | San Diego, San Diego Co, California |
| Buried | ||
| Spouse | Tiberius Bruno Molsbergen | F192458 | |
| Married | ||
| Child 7 | Female Agnes Elizabeth Martens |
| Born | 16 Dec 1896 | Milbank, Grant Co, South Dakota |
| Died | 26 Mar 1933 | Hennepin County, Minnesota |
| Buried | ||
| Spouse | Cornelius VanHoogen | F192447 | |
| Married | ||
| Child 8 | Female Catherine Jane Martens |
| Born | 19 Apr 1898 | Milbank, Grant Co, South Dakota |
| Died | 27 Apr 1918 | Milbank, Grant Co, South Dakota |
| Buried |
| Child 9 | Male John Henry Martens |
| Born | 06 Feb 1900 | Milbank, Grant Co, South Dakota |
| Died | 29 Apr 1958 | Multnomah County, Oregon |
| Buried |
| Child 10 | Female Alice Cecilia Martens |
| Born | 03 Dec 1901 | South Dakota |
| Died | 30 May 1929 | Milbank, Grant Co, South Dakota |
| Buried |