I am trying to find information about my great grandfather, Anthony. We are fairly certain he was born with the last name Zajac but changed it to Ziaonc when he emigrated to North America. He was born in Poland in 1900 (not absolutely certain of the year), served as a volunteer medic for the Polish Army during WWI (we believe). He also worked as a lumberjack in Canada before crossing over into the US. He had a sister named Bernice and a possible half-sister Viola. He married Anna Szklarz in the US and had one daughter, Dolores Bernice.