He is married to Ermengilde de Grez.
They got married
Child(ren):
http://fmg.ac/Projects/MedLands/BRABANT, LOUVAIN.htm
JAN [I] van Rivieren, son of KAREL & his wife Maria --- (-1226 or after). Heer van Schoonhoven.
m ERMENGILDE van Grez, daughter of WERNER van Grez & his wife ---. Her parentage and marriage are given by Herckenrode[605]
The data shown has no sources.