Abraham Ravett, born in Poland in 1947, is the son of Holocaust survivors. He grew up in Israel and the USA, where he still lives and teaches as a filmmaker. Ravett's mother, Fela, lost her family in the Holocaust, including her daughter, Tońcia, in the Auschwitz-Birkenau concentration camp. In his short film "Half-Sister," Ravett explores what kind of life his half-sister, whom he never knew, could have led, drawing on his mother's memories and Tońcia's only photograph.