My grandfather's half-sister is Leokadya Uszynska.
My grandfather is Aleksander Wyszynski(1879-1967), son of Jan Wyszynski and Agnieszka Gułaszewska. When his father died his mother Agnieszka Gułaszewska, remarried a man named Uszynski. They had a few kids but only Leokadya I know of. Leokadya Uszynska(1887-?) married Bolesław Ostrowski.
Alex Wisienski, firstname.lastname@example.org