I'm looking for my biological grandfather. My grandmother was Zoya Ivanovna Pliasovsky. Her step-father's name was Arseny Petrovich Vlasoff. Her mother was Ekaterina Mihailovna (Nikolaev) Vlasoff. Her biological father was Ivan Petrovich Pliasovsky. She was born in Russia in 1918. Her family fled from Russia to Tientsin (now Tianjin) in 1921. She graduated from St Louis French Catholic school. She dated a Jewish man in 1937. My dad was born as a result.