| Birth | May 20, 1866 38 38 |
| Birth of a brother | Charles Martens about 1868 (Age 19 months) |
| Birth of a brother | William Martens about 1872 (Age 5) |
| Death of a father | Johann “John” Martens 1875 (Age 8) |
| Residence | June 11, 1880 (Age 14) Note: John lived with his sister, Anna Harnack, after their father's death.
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| Residence | 1891 (Age 24) Note: working for Mrs. Fred Weber’s grandfather
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| Birth of a daughter #1 | Anna Elisa Martens November 4, 1896 (Age 30) |
| Birth of a daughter #2 | Ulinka Martens May 23, 1898 (Age 32) |
| Birth of a daughter #3 | Amanda Martens April 18, 1899 (Age 32) |
| Birth of a son #4 | Franz Martens September 5, 1902 (Age 36) |
| Birth of a son #5 | Walter Martens November 17, 1903 (Age 37) |
| Birth of a daughter #6 | Nora H. M. Martens April 16, 1906 (Age 39) |
| Birth of a son #7 | Bernard Martens 1907 (Age 40) |
| Death of a son | Bernard Martens 1907 (Age 40) Cause: Crib death |
| Birth of a son #8 | Arnold Martens 1909 (Age 42) |
| Birth of a son #9 | Bruno Martens 1909 (Age 42) |
| Death of a son | Arnold Martens 1909 (Age 42) Cause: Crib death |
| Death of a son | Bruno Martens 1909 (Age 42) Cause: Crib death |
| Birth of a son #10 | Henry Martens Jr March 12, 1910 (Age 43) |
| Birth of a son #11 | Alan Martens April 28, 1911 (Age 44) |
| Death of a son | Henry Martens Jr 1911 (Age 44) Cause: Pneumonia |
| Birth of a son #12 | Edmund F. Martens April 30, 1912 (Age 45) |
| Birth of a daughter #13 | Marie Martens February 14, 1913 (Age 46) |
| Death of a son | Franz Martens 1913 (Age 46) Cause: Ruptured appendix |
| Death of a son | Walter Martens 1914 (Age 47) Cause: Tonsillitis |
| Marriage of a child | Fredrick William Stredde — Ulinka Martens — View this family August 14, 1919 (Age 53) |
| Marriage of a child | Alfred M. Gill — Anna Elisa Martens — View this family February 18, 1926 (Age 59) |
| Marriage of a child | Otto Henry Rupkalvis — Amanda Martens — View this family October 30, 1931 (Age 65) |
| Death of a daughter | Ulinka Martens 1935 (Age 68) Cause: Childbirth |
| Death of a wife | Marie Koch 1944 (Age 77) Cause: Heart attack |
| Death | 1950 (Age 83) Cause of death: Brain damage |
| Family with parents |
| father |
Johann “John” Martens Birth: about 1828 — Germany Death: 1875 |
| mother |
Anna Mailens Birth: about 1828 — Prussia |
| elder sister |
Anna Martens Birth: about 1854 26 26 — Iowa, USA |
| brother | |
| sister | |
| elder brother |
John Martens Birth: about 1864 36 36 — Iowa, USA |
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2 years himself |
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|
3 years younger brother |
Charles Martens Birth: about 1868 40 40 — Iowa, USA |
|
5 years younger brother |
William Martens Birth: about 1872 44 44 — Iowa, USA |
| Family with Marie Koch |
| himself |
|
| wife |
|
| daughter |
Anna Elisa Martens Birth: November 4, 1896 30 21 — Iowa, USA Death: May 28, 1969 — Washington, USA |
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19 months daughter |
Ulinka Martens Birth: May 23, 1898 32 22 — Iowa, USA Death: 1935 — South Dakota, USA |
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11 months daughter |
Amanda Martens Birth: April 18, 1899 32 23 — Iowa, USA Death: July 21, 1976 — South Dakota, USA |
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3 years son |
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|
14 months son |
Walter Martens Birth: November 17, 1903 37 28 — Iowa, USA Death: 1914 — Iowa, USA |
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2 years daughter |
Nora H. M. Martens Birth: April 16, 1906 39 30 — Remsen, Plymouth, Iowa, USA Death: July 8, 1986 — Scottsdale, Maricopa, Arizona, USA |
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21 months son |
Bernard Martens Birth: 1907 40 31 — Iowa, USA Death: 1907 — Iowa, USA |
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3 years son |
Arnold Martens Birth: 1909 42 33 — Iowa, USA Death: 1909 — Iowa, USA |
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1 year son |
Bruno Martens Birth: 1909 42 33 — Iowa, USA Death: 1909 — Iowa, USA |
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14 months son |
Henry Martens Jr Birth: March 12, 1910 43 34 — South Dakota, USA Death: 1911 — South Dakota, USA |
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14 months son |
Alan Martens Birth: April 28, 1911 44 35 — South Dakota, USA Death: December 8, 1963 — South Dakota, USA |
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1 year son |
Edmund F. Martens Birth: April 30, 1912 45 36 — South Dakota, USA Death: January 1974 — La Crosse, La Crosse, Wisconsin, USA |
|
10 months daughter |
Marie Martens Birth: February 14, 1913 46 37 — South Dakota, USA Death: September 20, 1980 — South Dakota, USA |
| daughter |
Private |
| daughter |
Private |
| Residence | John lived with his sister, Anna Harnack, after their father's death. |
| Residence | working for Mrs. Fred Weber’s grandfather |
| Media object | Henry Martens.jpg Format: image/jpeg Type: Photo Highlighted image: yes |
| Media object | Henry Martens.jpg Format: image/jpeg Type: Photo Highlighted image: yes |
| Media object | Henry Martens.jpg Format: image/jpeg Type: Photo Highlighted image: yes |
| Media object | Henry Martens.jpg Format: image/jpeg Type: Photo Highlighted image: yes |
| Media object | Henry Martens.jpg Format: image/jpeg Type: Photo Highlighted image: yes |