Molokan Church Members S.F 1938

My family information is pretty limited. I am looking for my father's family members. The Afinsoff family. My grandparents lived in Klamath Falls, Los Angelos and then settled in San Francisco. On Caroline St. on Russian Hill. My 2 Uncles were musicians and changed their surnames to Alexander. George and Nick. They were known in the music field as the Alexander Brothers.My grandmother was an active member of the Molokan church in San Francisco. She passed away in 1974.