- Father of Matthias Wendlandt and Susan Nielebock
- Grandfather of Felix Wendlandt and Laura Wendlandt
- Born to Gregor Gubanov, a Russian, and his German wife Auguste Klempnow, he was adopted by his aunt Minna and her husband Fritz Wendlandt (1944).
- Artur Brauner claimed that Wendlandt stole him the idea of adapting the Karl May and Edgar Wallace novels.
- After he had worked for producer Artur Brauner from 1956 to 1961, he switched to "Rialto Film," becoming major shareholder in 1972.
- As he had been afraid of being imprisoned as a half-Russian in Nazi Germany, he joined the German Army (1944).
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