Abt 1840 - 
| Zofia Kostewicz | |
| B: | 1896 |
| D: | 20 Jul 1897 |
| Popowo, gm. Nasielsk | |
| Michał Kostewicz | |
| B: | 28 Sep 1898 |
| Popowo, gm. Nasielsk | |
| D: | Yes, date unknown |
| Władysław Kostewicz | |
| B: | 1902 |
| D: | 22 Nov 1925 |
| Popowo | |
| Antoni Kostewicz | |
| B: | Abt 1867 |
| Popowo | |
| Michalina Wiktoria Kostewicz (née Bober) | |
| B: | Abt 1873 |
| M: | 1893 |
| Nasielsk - kościół par. pw. św. Wojciecha, nowodworski, mazowieckie, Polska | |
| Władysław Kostewicz | |
| B: | 4 Jan 1876 |
| Popowo, gm. Nasielsk | |
| D: | 27 Apr 1889 |
| Popowo, gm. Nasielsk | |
| Aleksander Kostewicz | |
| B: | 1908 |
| Popowo, gm. Nasielsk | |
| Konstanty Kostewicz | |
| B: | 5 Jun 1879 |
| Popowo, gm. Nasielsk | |
| Antonina Kostewicz (née Mikulska) | |
| B: | Yes, date unknown |
| M: | Yes, date unknown |
| D: | Yes, date unknown |
| Kazimierz Kostewicz | |
| B: | 14 Jul 1882 |
| Popowo | |
| D: | Jan 1904 |
| Popowo, gm. Nasielsk | |
| Albin Kostewicz | |
| B: | 9 Oct 1908 |
| Popowo, gm. Nasielsk | |
| Józef Kostewicz | |
| B: | 6 Nov 1885 |
| Popowo, gm. Nasielsk | |
| D: | Yes, date unknown |
| Stefania Kostewicz (née Kondracka) | |
| B: | Yes, date unknown |
| M: | Yes, date unknown |
| D: | Yes, date unknown |
| Wojciech Kostewicz | |
| B: | Abt 1840 |
| Marianna Kostewicz (née Zabielska) | |
| B: | Abt 1848 |
| M: | Yes, date unknown |
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