Your great-grandfather and my gg-grandfather were brothers. My gg-grandfather was William Valentine Adamczak (married to Agnes Fabisiak). They had 10 children - one of them was my great-grandfather Peter John Adamczak.
Clearly we're related, if only distantly, and I'd love to share research. I can trace Adamczaks back to the 1700s.
Looking forward to hearing from you!