My grandfather was William Szablewski born in Poland, died in Milwaukee WI. He was married to Victoria.
They had 6 children: John b.1915, Leonard b.1923, Thadeous b. 1917, Ester, Dorothy and Estelle.
My father was John.
Perhaps the person you are seeking was a cousin??? I don't have alot of data, but willing to share if you think there might be a connection.