hi Phyllis, I'm looking for Dziuba genealogy too. Halla Dzuiba (b. 1924) was my dad's mom. Her brother was Wasyl Dziuba. I did a search on Wasyl Dziuba and found 'born 1920' (which would be right), 'died 1976, last social security payment in Chicago, Illinois'.
Halla's father was Porfiri Dzuiba, we have a feeling he had one or more brothers (Porfiri was called Paul for ease, I'm guessing John was a westernised name also) of which John may have been one. Porfiri was born in Poland and Halla was born in Poltauski, Ukraine. They came to Australia in 1948ish. Sorry I can't be more help, perhaps our searches will cross paths again.