reporter: joanna sobolewska-pyz was four years old when she was rescued from the warsaw ghetto. she was saved by polish resistance fighters. it would be years before she discovered how lucky she'd been. joanna: this is me. reporter: this is her earliest photo, taken after the occupation. her jewish parents had her smuggled out of the ghetto, something she no longer remembers. joanna: my father was called grunspan, and my mother, silberbart. reporter: how did you discover what had happened to you? joanna: i found family members in israel. after i first heard the old family names, i wrote to an israeli newspaper, and that's how i found an uncle. reporter: one day prior to the ghetto uprising, sobolewska-pyz was brought to a polish resistance fighter here in warsaw, a woman, who found adoptive parents for sobolewska-pyz. her new parents had her baptized as catholic. it wasn't until her 18th birthday that she found out about her jewish origins. wanting to learn more about her parents, sobolewska-pyz contacted the former resistance fighter. joanna: she told me, you have to be grateful