and related: Kiliś, Kostewicz, Pawelski, Sadlakowski, Wyrzykowski...
| Male Marian Bogusław Niżnik |
| Birth | 08 Dec 1950 | Warszawa, mazowieckie, Polska |
| Death | 20 Apr 2009 | |
| Burial | 27 Apr 2009 | Warszawa - cmentarz Bródnowski, mazowieckie, Polska |
| Marriage | ||
| Father | Mikołaj Niżnik | F1192 Group Sheet | |
| Mother | Zenobia Niżnik (maid. name Mrozowicz) | F1192 Group Sheet | |
| Female Helena Niżnik (maid. name Radecka) |
| Birth | ||
| Death | ||
| Burial | ||
| Father | Henryk Radecki | F1405 Group Sheet | |
| Mother | Helena Radecka (maid. name Sakowska) | F1405 Group Sheet | |
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