+---- Jacobus van Gulik
+---- Willem Jacobus van Gulik 1834-1910
| +---- Johanna Dorothea Brouwer
+---- Willem Jacobus van Gulik ca 1871-1953
| | +---- Jan Willem Draaijer
| +---- Margaretha Stoffelina Draaijer ca 1838-
| +---- Petronella Reede
+---- Robert Hans van Gulik
| | +---- Engelbertus de Ruiter
| +---- Bertha de Ruiter ca 1870-/1945
| +---- Bertha Kock
==== Willem Robert van Gulik
| +---- Chün-shao Shui
+---- Shih-fang Shui
+---- N.N. K'uai
|