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anton piecks zwillingsbruder henri christiaan pieck war ebenfalls maler, zeichner und illustrator.
he was the son of henri christiaan pieck and petronella neijfs, and twin brother of the painter and illustrator henri christiaan pieck.
friedrich hatte einen jüngeren zwillingsbruder, "franz joseph prinz von hohenzollern" (1891–1964).
he had a twin brother, franz joseph, prince of hohenzollern-emden, who was born a few minutes after he was.