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Son of Jan "John" Gronke and Dorota Grzonka Husband of Leocadia Dargatz Father of Private Brother of Dominica Rutkowski; Appolonia Gronke; Robert Frank Gronke; John Michael Gronke, Jr.; Bernard "Ben" Gronke and 1 other; and Maggie Gronke « less Half brother of Anna Wojciechowska and Piotr "Nicolay" Mikołaj Gronke