Janusz Korwin-Mikke was born in German-occupied Warsaw on 27 October 1942. He was the only child of Ryszard Mikke and Maria Rosochacka. His father was the head of an engineering department of the State Aviation Works. After the death of his mother during the Warsaw Uprising in 1944, he was under the care of his grandmother and later stepmother. Janusz Korwin-Mikke's great-grandfather was Gustaw Izydor Mikke aka Mücke, son of Samuel Beniamin Mücke (who was a brewer in Kielce) and grandson of Samuel Mücke.