Try the indices in the following link

https://www.ojm.at/blog/indizes/indizes-deutschkreutz/

The town was known to Jews as Tselim to avoid saying kreutz cross.

The records are available online on the Familysearch website.

Jacob Shayzaf Israel   <Schonfeld.family@...>

Norbert Steiner  <steiner71@...>  wrote:
My father grew up in a town now known as Deutschkreutz in Austria. Though the name is a German name everybody in the town speaks Hungarian. He told me that he had siblings (I know all 4), half siblings and step siblings (none of whom I know). The only thing I know about one of them is that he went to Australia and won a Bronze medal at the Olympics in California for Australia. Can anyone advise me where or how to look for those half- and step-siblings? I believe that I have exhausted all data banks that I know of but there must be others that I know nothing of. How does anyone look for documents without physically going to the towns and villages where they lived?