Kammala jumla mai zuwa: An haifi Ona Brazauskaitė a ranar 9 ga Satumba, 1883 a ƙauyen Anykščiai Parish na Daular Rasha zuwa Jadwiga ("née" Michalowska, wanda aka fi sani da Jadvyga Mikalauskaitė) da Gustavas Brazauskas (Gustaw Brzezowski). Iyayenta sun hadu lokacin da aka daure Brazauskas saboda sa hannu a cikin
1863 tawaye da mulkin Rasha tare da mahaifin Jadwiga. Daga gado mai daraja, iyalinta na yara takwas suna magana da yaren Poland a gida amma sun rarrabu kan ko sun bayyana kansu a matsayin Lithuanian ko Yaren mutanen Poland. Brazauskas ya ba da shawara ga hadadden jihar Lithuania da Poland kuma ya rarraba littattafai a cikin yaren Lithuania, aikin da aka haramta a lokacin.