Dear Jean Enyart
hoping my answer will find you well.
I supose Joseph Atnhony Sistek was a son of Joseoph (Josef) Brych, from South Bohemia, brother of my grandmother. I have some photos of him and Joseph Jn. as well, and a cuttimg from czech newspaper from Omaha, where is stated that Josef Brych Sn. died t 1937, leaving after him a daughter Mary and sons Josef.a. Sistek ( Advance, MOntana) and Emil F. sistek (Omaha),
If you're interessted please contact me firstname.lastname@example.org