Could be. Looks like they'd give the information about his biological parents.
Name two famous Croatian-Americans. Nick Saban and Bill Belichick.
I suspect the barren couple in their fifties were allowed to adopt a relative’s children from that region.
A newborn and toddler placed with older folks is very unusual.
Lynda Cruz’s sister-in-law, Barbara Kumbatovic of Long island may know where they came from.