Svetlana Alliluyeva, Stalins only daughter, defected from the Soviet Union in 1966 and married Evans future father, architect William Wesley Peters.
I met Stalin’s daughter in the ‘80’s. Very nice lady. My BFF’s mom is a seamstress and had done some seamstress work for Svetlana and we delivered the clothes to her at the hotel she was staying at.
from what I have read, Svetlana led a rather unhappy and very unsettled life.