I have no idea how to get information on relatives in Poland. I am looking for my great great grandfather's siblings and their children that might still be alive. My great great grandfather's name is Walter (Wladislaw in Polish) Bednarski. His mother was Anna Ciesielski (maiden name) and his father was Ignatz Bednarski. He lived in Mlawa, Poland (although I think it may have been under Russia's control at some point). His birth date is 06/21/1895. I really want to find the name of his sibling and hopefully their children.

Can anyone help me????