Family Group Sheet| FATHER | | Sjoerd Jans Monkelbaan | | BIRTH | 26 March 1880 | Oudemirdum | | DEATH | 1 June 1957 | Bakhuizen | | FATHER | Jan Jans Monkelbaan | | MOTHER | Aat Johannes Portiek | | | | MOTHER | | Harmke Lammerts de Jong | | BIRTH | 13 May 1882 | Mirns | | FATHER | Lammert Johannes de Jong | | MOTHER | Stijntje Luitjens Brouwer |
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