Willi Borchardt

Heirat_1913: https://www.ancestry.co.uk/discoveryui-content/view/22207233:2957
Divorced 1919

Heirat_1920: https://www.ancestry.co.uk/discoveryui-content/view/22156339:2957
Divorced 1939; but maybe remarried, since she is shown as his wife on his death certificate

17 May 1939 at Berlin address with a Rebecka Borchardt (born Feb 1885, no maiden name), who we infer to be a relation:
https://www.mappingthelives.org/bio/dda76278-aabc-4248-a11d-6fb6408...
Both JJJJ.
Rebecka is deported 1941; he is not deported.
Rebecka is unlikely to be full sister, because Willi's mother was born July 1867
Rebecka appears in two My Heritage trees, both of which show her as a child of Neumann (born Feb 1863); although I suspect this is a "guess" using the census information only, I am adopting the same approach.

Sterbe: https://www.ancestry.co.uk/discoveryui-content/view/6035001:2958
Listed as evangelisch