Tatiana's father was born in Slovenia(when it was Yugoslavia) , his parents had a small shoe factory, after the Second World War, the business spread to countries such as Austria, Switzerland and America. Tatiana's father had residences in Switzerland and Venezuela.
Princess Tatiana has spoken in some interviews about her father, he died in 1986 in Switzerland , she was only 6 years old. In addition, her parents had separated shortly after she was born at 1980. Consequence of all this,( the separation of his parents, and the death of his father in 1986) is that she has few memories of her father, but she keeps a very special memory, she remembers her father teaching her to whistle
JR76 , A while back, I found a website of genealogical trees, where Countess Ellinka was, you are right, she has ancestry in the Austrian-Hungarian-German nobility