Yes, date unknown - 1902
 | Maria Włoczewska (née Piotrowicz) Yes, date unknown-1886 |
| Maria Włoczewska (née Piotrowicz) | |
| B: | Yes, date unknown |
| D: | 1886 |
| Płock, mazowieckie, Polska | |
| Kazimiera Innocenta de Prechamps (née Piotrowicz) 1848-Yes, date unknown |
| Kazimiera Innocenta de Prechamps (née Piotrowicz) | |
| B: | 1848 |
| Płock, mazowieckie, Polska | |
| D: | Yes, date unknown |
 | Leon de Prechamps Abt 1845-Yes, date unknown |
| Leon de Prechamps | |
| B: | Abt 1845 |
| M: | 1866 |
| Płock - Bazylika katedralna Wniebowzięcia NMP, mazowieckie, Polska | |
| D: | Yes, date unknown |
| Jan Aleksander Piotrowicz 1851-1889 |
| Jan Aleksander Piotrowicz | |
| B: | 1851 |
| Płock, mazowieckie, Polska | |
| D: | 1889 |
| Płock, mazowieckie, Polska | |
|
| Adolfina Piotrowicz (née Kowalewska) Yes, date unknown-1902 |
| Adolfina Piotrowicz (née Kowalewska) | |
| B: | Yes, date unknown |
| D: | 1902 |
| Płock, mazowieckie, Polska | |
| Kazimierz Piotrowicz Yes, date unknown-Yes, date unknown |
| Kazimierz Piotrowicz | |
| B: | Yes, date unknown |
| M: | 1846 |
| Płock - Bazylika katedralna Wniebowzięcia NMP, mazowieckie, Polska | |
| D: | Yes, date unknown |
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