Hij is getrouwd met Wilhelmina Berendina (Mientje) Menges.
Zij zijn getrouwd op 20 juli 1936 te Heemstede, Noord-Holland, The Netherlands , hij was toen 29 jaar oud.
Bobby Gronert died as a prisoner of war aboard the Japanese transport ship "Junyo Maru"' torpedoed by British U-boat MS Tradewinds..
Gerard (Bobby) Gronert is memtioned in the "War Death Registry of the Netherlands". He was a GI in the Infantry of the KNIL (Dutch Colonial Army) at the time of his capture by the Japanese.
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