Old Photos: my mother and her astray father

On the right is my mother. There has never been a human being more beautiful than her. It has been true for when I have been a child and remains so to this day. My Mother, Zoya Matveevna Vlasova, is the most beautiful human being on this planet. On the left of this 'old photo painting' (Acrylic, Mylar 21x32) is her father, Matvey, who evacuated with his factory in 1941 leaving behind his wife, my grandmother, and 11 y.o. Zoya, to the city panicking over advancing Nazi army.  His daughter from another marriage is in the middle. Her name escapes my memory. I've never met my biological grandfather, but still remember the awkward visit many years later of my mom's half-sister...