Yelena And Natasha As Sisters
In Black Widow, we also meet Florence Pugh’s Yelena Belova, who is not Natasha’s blood relative, but foster sister who lives alongside her with Alexei and Melina in Ohio before going with her to the Red Room as a young girl. Following their training and Natasha leaving in the Red Room, they lose contact until the events of Black Widow. In the movie, they reunite to take down the facility that they gave away their childhood for. At first, Natasha claims they are not blood relatives, thus not really sisters, but by the ending, they conclude their sister bond is “real” to the both of them.