Tekla Juniewicz was born in present-day Ukraine and studied at the convent of Sisters' Szarytki, who would give her the nickname of "Kluska". She married in 1927 and had two daughters: Janina and Urszula, who are currently, respectively, 88 and 87 years old. In 1945, during the repatriation and upon the political changes after World War II, the family moved to Gliwice in Upper Silesia where she has lived ever since. In 2016, Tekla Juniewicz was recognised as the second-oldest living resident of Poland.