He is married to Maria Therese Constance van Schlabrendorff.
They got married on June 3, 1799 at Wenen, he was 20 years old.
Child(ren):
Bron: http://genealogics.org/getperson.php?personID=I00045976&tree=LEO
en: http://geneall.net/de/name/259907/johann-ernst-graf-hoyos/
en: http://www.dinastias.com/cgi-bin/gwd.exe?b=dinastias;lang=en;i=48025
en: http://gw.geneanet.org/jksir?lang=fr;pz=olivia+anezka+adeline;nz=ksir;ocz=0;p=johann+ernst+philipp;n=hoyos
The data shown has no sources.