I was thrilled to get your reply. The man you speak of, Dusan Kenjalo, seems to be my grandfather. He went by the name of Dan when he lived in the US. My grandmother's name was Helen, and yes, she was born in Poland. He died in 1941 when my mother was quite young, but I have been told he had owned a hotel in Yogoslavia.
I would love to hear more about Slavojka's family. I know very little of the Kenjalo family, but know a little bit about Dan/Dusan when he lived in Montana, USA if you are interested.
Looking forward to hearing from you again.