looking for family in Australia from Poland name Cohen/Kohn #poland

Mister Kessler

I am trying to track down the descendents of family members who moved to Australia during World War II from Warsaw. He was a doctor who ran a clinic for the deaf. She was my great grandmother's sister; I believe her name was Freidl Cohen/Kohn. They escaped Poland, she posing as a nonJew, he as a deaf person. They moved to Sydney and had children who I believe still live in Sydney. Any information or leads is greatly appreciated. 

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