Katarina, I realize it has been a long time since you posted here, but maybe we manage to get in touch anyway. I believe your father is my father's brother. Although some of the information do not coincide completely, I do believe this is the case. What I know is this: my father Tone has a brother, Slavko, born in 1939, who moved to Canada, when my father was only 5 years old - that was in 1959. I know that Slavko was born in Mostar (Bosnia and Hercegovina - country next to Croatia) and the family later moved to Slovenia, befor the WWII started. But there were only 5 siblings: Slavko, Tone, Milka, Majda and Nada. Nobody else emigrated anywhere, except for Slavko they all live in Slovenia. My father also confirmed to me there was an aunt who was a nun and that one of Slavko's daughters was named Katarina - this was actually also the name of my (and if this is the case, also your) grandmother.Please contact me if this message reaches you.