A hint to De Blasio is that he was born with the last name of Willhelm and took his Mother's last name of De Blasio (due to the divorce). I still think there might be a relation. Cousins maybe? There is a John Willhelm also, did he take the last name of De Blasio also? IDK, this could lead nowhere, but what a find it would be to connect them. Hope this is not a dead end, but I have researched a lot of those as I am sure you have too.
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carmencita ago
A hint to De Blasio is that he was born with the last name of Willhelm and took his Mother's last name of De Blasio (due to the divorce). I still think there might be a relation. Cousins maybe? There is a John Willhelm also, did he take the last name of De Blasio also? IDK, this could lead nowhere, but what a find it would be to connect them. Hope this is not a dead end, but I have researched a lot of those as I am sure you have too.