Johannes Gijsbertus Koene1887–
- Name
- Johannes Gijsbertus Koene
| Birth | estimated as equal to wife's birth year about 1887 |
| Birth of a daughter #1 | Agathe Gerardina Koene September 3, 1912 (Age 25 years) |
| Death of a daughter | Agathe Gerardina Koene after 1987 (Age 100 years) |
| Alfred W. Generation |
| Family with Theodora Paulina Jacoba Masthoff |
| himself |
Johannes Gijsbertus Koene Birth: estimated as equal to wife's birth year — about 1887 |
| wife |
Theodora Paulina Jacoba Masthoff Birth: estimated a gap of 25 years — about 1887 Death: estimated as prior to marriage by 25 years |
| daughter |
Agathe Gerardina Koene Birth: September 3, 1912 25 25 — Pangkalanbrandan (Oostkust van Sumatra), Netherlands East Indies Death: after 1987 |