I have a Wladyslaw Sobanski born in 1851. I believe he was born in Rogozno, Poland which is near Posnan. He was a half-brother of my great grandfather. His father was Joannes Martin Sobanski and his mother was Catherine Hodosinska. What year was your Wladyslaw born? Your city of birth isn't too far from Rogozno. Any connection?
Virginia Clark