He is married to Maria Johanna Kolff.
They got married on November 18, 1909 at Rotterdam, Zuid-Holland, Netherlands , he was 32 years old.
Child(ren):
Nederland'd adelsboek 1905, p. 320
https://nl.wikipedia.org/wiki/Fran%C3%A7ois_Eug%C3%A8ne_van_Heerdt
François Eugène baron van Heerdt | |||||||||||||||||||||||||||||||||||
1909 | |||||||||||||||||||||||||||||||||||
Maria Johanna Kolff |
The data shown has no sources.