His father is named as Hermann Czwicklitzer. The paternal link I show here is speculative, based only on Hermann being of similar age to Otto's mother and a lack of contrary information. It may be significant that Otto's second name, Simon, was the name of Hermann's father.

The Yad Vashem testimonial written by his sister-in-law relates to an Otto Czwiklitzer who lived in Breslau and was deported on 03/10/1942.