Searching for my cousins

[Olgaprochazkova]

My maiden name was Olga Prochazkova. I was born in Prague in 1943. My family left the country in 1949. I know that my father, Ludvik Prochazka, born 29 October 1911, had an older sister, Vera Hola, who had three children. My grandfather was Frantisek Prochazka, also born in Prague. Furthermore, I know that my aunt, Vera Hola was still alive in 1993 but no longer living in Prague. I tried to contact her then but was not successful.
I would like to find my father's family.

My mother was an only child and I am not aware of any possible close realtives.

My family emigrated to Paraguay and later I came to the USA. I live near Las Vegas, Nevada, and work in health care. I have visited Prague twice this year and I am planning to return next year again.
I will appreciate any leads.
Olga