Kitty Hart-Moxon was born Kitty Felix, on 1 December 1926, in the southern Polish town of Bielsko (known as Bielitz in German), which bordered both Germany and Czechoslovakia. She was the second child of Karol Felix and his wife Lola Rosa Felix, who had a son five years Kitty's senior, named Robert. Karol Felix (born c. 1888) had studied law in Vienna, and had also been a captain in the Austrian army in the First World War. Upon his father's death, he took over his agricultural supply business, which he ran with his sister, until the outbreak of the war. Lola's father was also in the agricultural business: he was a farmer, who owned his own land, and Kitty believes that this may have been how her parents met—with Lola’s father potentially using Karol as a supplier. Kitty’s paternal family had come from Italy hundreds of years ago—it had been said that one of her ancestors had been called to attend to the King of Poland, as he was a doctor, and that is how the family came to reside in Poland. Her mother was born on 18 February 1890, to a Slovakian father and his wife. Lola’s sister had studied medicine in Vienna, and Lola herself went to England in 1911 to study English at Bedford College, London—eventually becoming an English teacher in Poland, where she taught children preparing for their state examinations (this meant it was an advanced level of English learning).