Ivanko,
Regarding Fedor (Theodore) Semak , uncle who immigrated to Argentina in 1936:
Boris Kondratiuk, Argentinian Ukrainian, is the keeper of the Argentinian Directories. Contact him and ask for any info he may have. Fedor may have had a family and you may also have cousins in Argentina???
When you contact him, don't forget that the name of the village when Fedor emigrated was Ulicko Seredkiewicz > Rawa Ruska > Lwow.
Boris' e-mail
brk42@hotmail.com
Please make sure to pass on my regards to Boris.