Although she did not say so Christel already had that information as well as his parents, grandparents and great grandparents.He went back to Antwerpen with his parents because he is not listed as deceased in the Kallo records as a child and he is not listed as deceased in Antwerpen before 1917, I already checked the availabe on-line records and did not see him listed.
I think she is trying to find him after 1898, good luck with that unless you personally go to the State Archives. He probably did not get married until after 1920 or so if alive. Maybe he was in the Military During the First World War 1914-1918 ???? he was the right age. I will see if he is listed in any Military Cemeteries.