Long-lost letter reunites families of two Jewish sisters and the Polish farmer who saved them from the Nazis

Sisters Jadwiga (L) and Felicja (R) Kejzman

(CNN)As a child growing up in Sweden, Karolina Jurzyk didn't pay much attention to her grandfather's tales of wartime Poland.

Now, however, thanks to a long-forgotten letter, Jurzyk, 35, has uncovered the truth about how her family rescued and hid two Jewish sisters from the Nazis.
Having moved to Stockholm as a baby, Jurzyk grew up hearing from her grandparents about her great-grandfather's bravery -- though details were scant.
    "I was very close to my grandparents," she told CNN. "I spent every school holiday with them in Poland and World War II was very present because they both survived it."
      Jadwiga (L) and Fela (R) wrote to Jurzyk's great-grandfather after the war to thank him for saving their lives.
      Her grandfather, Stanislaw Jurzyk, told her that in 1942, aged 12, while playing on the family farm in Gostchorz -- a village about 68 miles east of Warsaw -- he stumbled across two women, both in their 20s.
      Shocked, he told his parents, who revealed that they had been hiding the sisters since finding them in their fields.
      "They were badly beaten and very weak," Karolina Jurzyk, who works as a pattern maker for H&M in Stockholm, told CNN. According to her grandfather, the sisters were orphaned -- but they spoke little of their past.
        Stanislaw was sworn to secrecy by his father -- also called Stanislaw. That same year, his mother, Helena, died in childbirth -- leaving Stanislaw Senior to raise the children alone, while still protecting the women.
        Under the Nazi regime, anyone found to be hiding Jews risked severe punishment -- including the death penalty -- if captured.
        Stanislaw Jurzyk Senior and his wife Helena, with their daughter Alina and baby son, also named Stanislaw 

Courtesy Karolina Jurzyk
        Jurzyk didn't know her great-grandfather, who died in 1989, and her surviving relatives knew nothing about the sisters' fate after they left the farm two years later.
        But when her father, Wojciech, 60, recently discovered a letter, her interest was sparked. Tattered and scrawled in old Polish, it was almost impossible to decipher the correspondence that her grandfather had sometimes talked about.
        One thing was clear, however: The correspondents' names -- Fela and Jadzia Kejzman. Jurzyk, who until then had only known the women's first names, ventured online for clues.
        The letter was recently discovered by Jurzyk's father, but the old-style Polish made it hard to decipher.

        A simple online search returned both sisters' names

        Both names appeared on genealogy site MyHeritage. Excited and nervous, Jurzyk messaged the family tree's host.
        Karen Norman, 42, a New York-based real estate agent, replied. She is the granddaughter of Jadzia, whose full given name was Jadwiga.