I think I found Paul Parczewski twice on passenger lists in 1938 (ship Champlain) and 1939 (ship Champlain). He went to his brother A. PARSKY in New York, and his wife Marjem remained in Paris, 83bis rue Lafayette. In 1942 I found another passenger list of the ship "Serpa Pinto" from Casablanca to New York. Marjem Parczewski nee Glajchmann and Claude Jacques Benjamin Parczewski are on it. Bajla Glajchmann was Marjems mother who lived in Ogrodowa, Warsaw, Poland and they went to Marjems husband Paul Parsky in New York.
You can look at this three passenger lists on familysearch, each list contains two pages.