Karin Smirnov or Smirnoff (née Strindberg; 26 February 1880 – 10 May 1973) was a Finno-Swedish writer. She was the daughter of August Strindberg and Siri von Essen. Smirnov was a socialist; she married Russian Bolshevik Vladimir Smirnov. She wrote plays and also books about her mother and father, and their marriage. She lived in Finland from 1893 to 1918 and in Sweden from 1918 onwards. . Works.
https://en.wikipedia.org/wiki/Karin_Smirnov