Hi Jewishgenners

I live in Paris.
I seek information on the two following people :

Benno SELIG
bn. 10.05 1885,  d. 17.01.1931 Mannheim

Is it possible to discover, WHERE he was born?
He was a factory owner in Mannheim

He married my grandmother, Martha née OPPENHEIMER, who was born
26.11.1897, Bad Mergentheim, Germany
he was her first husband.

They had one son, my father, Martin SELIG bn. 11.06.1922
-------------------------
Helene WOLFF,
bn.  25.9. 1862, Koenigsberg.

She married Salomon BLUMENTHAL,
(bn.  Wormdit, 17.07.1861)

I know that Salomon lived until 1940, but have no knowledge of Helene's
death.
She is not buried in Weissensee, and had died earlier.

Thanks for any help
Best wishes to all

David SELIG
Paris, France