He is married to Annie Steffens.
They got married in the year 1949 at Oldenzaal (Ov.) , he was 29 years old.
BS Oldenzaal, Ondertrouwd:
G.J. Kienhuis 29j. (Denekamp) en J.M.A. Steffens 26j.
Bron ondertrouw: Twentsch dagblad Tubantia en Enschedesche courant en Vrije Twentsche courant, 18-06-1949 ; Delpher ; 20230820.
Bron: Overlijdensbericht Annie Kienhuis-Steffens ; Tubantia ; https://mensenlinq.nl/overlijdensberichten/?date_from=2005-12-01&date_to=2020-03-11&advanced=1&lastname=Steffens&city=&title=&province= ; 20200311.
The data shown has no sources.