Fritz was born on March 25th, 1889.1 Fritz's father was Gyula Thirring and his mother was Marietta Malovich. His paternal grandparents were Nándor Thirring and Teréz Haberlandt. He had two brothers and a sister, named Hans, Július and Margarete. He was the second oldest of the four children. He died at the age of 3 on February 19th, 1893.1