Good to hear from you. Many Europeans can speak English
and if you write to someone who does not, they can easily find someone who does. I would write to all those that I have listed. Czechs are cordial people and like Americans.
Here is how you would address the envelopes:
Mr Alois Ondrasek
U Parko 14 (U Parko 14 is street and house #)
Ostrava ( Ostrava is name of town)
Mr Josef Navratil
Ublo 1 ( Ublo 1 is village and house #)
Because there are so many Navratils, when you to the few
that I have listed , ask them to pass the word to the other
Navratils that you are seeking info.
Good Humting!!. If you need me ,don't hesitate to ask.