my name is Janusz Uszko. I'm from Krakow, Poland. Filling gaps in my family tree, I'm looking for my grandfather's brothers and sisters, and relations to his parents. My grandfather's name is Michal Uszko (born 1913 in Zglobice, Poland), son of Wladyslaw Uszko and Maria Uszko (I couldn't find her maiden name). I appreciate any information regarding family.
Thank you very much for help in advance.