Adolph Sternau (1865-1929) Dortmund, Germany

I am looking to trace my ancestry and I have hit a dead end with Adolph Sternau in Dortmund, Germany. I know that there are a lot of Sternau's out there but I cant trace my ancestry to any of them. If anyone is able to identify Adolph in there family tree please let me know.

Tim Sternau