Johannes was the son of son of Johanna van der Horst.
Sources
Find a Grave, database and images, memorial page for Johannes Martens (26 Oct 1915–19 Oct 1991), Find A Grave: Memorial #191552260, citing Chilliwack Cemeteries, Chilliwack, Fraser Valley Regional District, British Columbia, Canada; Maintained by Islandergirl (contributor 48322933).
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