Ancestors of Johannes Olivier 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
             |       |       /--Barent Johannes Momma  b. 28 NOV 1811 at Amsterdam, Netherlands  d. 28 NOV 1871 =>
             |       \--Johanna Jacoba Elisabeth Momma  b. 19 SEP 1861 at Amsterdam, Netherlands  d. 12 OCT 1946
             |               \--Elisabeth Jacoba De Petersen  b. 8 MAY 1819 at Amsterdam, Netherlands  d. 18 OCT 1885 =>
Johannes Olivier Kalff  b. 20 JUN 1922 at Amsterdam
             |       /--Herman De Vries Robbé
             \--Margaret De Vries Robbé  b. 29 SEP 1894 at Amsterdam
                     \--Alice Joynson