When Margaretha Pentz was born on 14 March 1870, in Biled, Torontál, Hungary, her father, Jacobus Pentz, was 36 and her mother, Elisabetha Potentz, was 32. She married Joannes Grossz on 13 February 1888, in Biled, Torontál, Hungary. They were the parents of at least 1 son and 2 daughters. She died on 7 March 1942, in her hometown, at the age of 71.