Don't know WHERE TO FIND "LIVING RELATIVE": "Zdenek Hruska"??

Can someone give me a tip, to see where I should START?? .... I don't even know if my Uncle, "Zdenek Hruska" still LIVES in the Czech Republic, or not? I do not have his EXACT birthdate! I only know that he was 8 yrs. YOUNGER than my Mom, Vera (Hruskova) Kucera. My Mom passed away in January, 2020, and my Dad, Daniel Kucera, passed awy Sept.,2022. Ivana (Kucera) Holmes