He is married to Charlotte Caroline Amalia van Waldburg-Capustigall Vrouwe van Rautenburg.
They got married on June 29, 1744 at Kaliningrad (Königsberg), Rusland, he was 45 years old.
Child(ren):
Bron: http://genealogics.org/getperson.php?personID=I00435229&tree=LEO
en: https://geneall.net/de/name/1019963/gebhard-johann-friedrich-von-keyserlingk/
The data shown has no sources.