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Son of Siebe Jans Boomsma and Bregtje Oebeles Senneker Brother of Oebele Siebes Boomsma; Trijntje Boomsma; Jan Siebes Boomsma; Dirk Siebes Boomsma; Ynze Siebes Boomsma and 2 others; Fokke Siebes Boomsma and Willem Siebes Boomsma « less