About Sara-Nina Levy
According to Yad Vashem information submitted by her niece Nata Gattegno, Sarina was 34 when she perished in the Holocaust in 1944, suggesting a 1910 birth date. This means she was not the child that caused her mother's death in childbirth in 1915, that must have been a child who died in the birth as well, unless Kalomira actually died in 1910 and not 1915, which is an unconfirmed, and possibly approximate, date.
According to the Yad Vashem document, Sarina's husband was named Josef Levy. In her autobiography, Nata refers to him as Nissim. They had two children.