There are at least two Karl Wiegenfelds. This one is a generation older than Nina Hassan.
Perhaps the brother is this one:
Karl Wiegenfeld 1871-1898 m Franziska Fisula b 1872.
I'm confused about the different generation of Wiegenfelds. What reaction is Jenny to Hanni Wiegenfeld?
I don't know Jenny Wiegenfeld's birth year but her husband, Rezso Hassan was born about 1858 and Carl/Karl is her brother.
Your Carl seems too old and my Karl too young.
