Hello. My son's father was a Mike Kostrzewa..deceased in 1985. My grandsons name is also Mike Kostrzewa. There is a whole enclave of Kostrzewas in Michigan...particularly Saginaw/Flint..and we have a book that was compiled by Ernest Kostrzewa (my son's grandfather) with a ton of family history and pictures. They may have some info to help you..or aid you in finding the right Mike Kostrzewa. Will send you a link if I can find one...sorry to be of so little help.