Kammala jumla mai zuwa: An haifi Birger Carlstedt a Helsinki ga ɗan kasuwa John Wilhelm Carlstedt da mai gidan abinci Amanda Josefina Lindström. Carlstedt yana da ɗan'uwa wanda ya mutu a matsayin yaro da ɗan'uwa, Knut Wilhelm. An ce 'yan'uwan biyu sun kasance kusa. An haifi Knut a 1910 kuma ya mutu a
Yaƙin hunturu.