Ancestors of Gerrit Kalff

                     /--Gerrit Jurriaan Kalff
             /--Gerrit Kalff  b. 30 JUN 1856 at Zwolle  d. 31 AUG 1923
             |       \--Catherina Margaretha Muller
Gerrit Kalff  b. 1 SEP 1889 at Amsterdam  d. 1 AUG 1955
             |               /--Willem Carel Momma  b. 17 JUN 1781 at Amsterdam, Netherlands  d. 10 DEC 1851
             |       /--Barent Johannes Momma  b. 28 NOV 1811 at Amsterdam, Netherlands  d. 28 NOV 1871
             |       |       \--Anna Elisabeth Cramer  b. 13 JUN 1784 at Amsterdam, Netherlands  d. 7 JUN 1869
             \--Johanna Jacoba Elisabeth Momma  b. 19 SEP 1861 at Amsterdam, Netherlands  d. 12 OCT 1946
                     |       /--Isaac Ernst De Petersen
                     \--Elisabeth Jacoba De Petersen  b. 8 MAY 1819 at Amsterdam, Netherlands  d. 18 OCT 1885
                             \--Elisabeth Clasina Voombergh