My Sisters: The Past is a spin-off of the original series "My Sisters", which focuses on the past of Anna and Jack.
Anna Arthur is a 17-year-old teenager who is teased by Janet, Jack Wozny's friend, because she comes from a poor family. She falls in love with Jack in 1988, her freshman year of high school. The action takes place in 1990s New York, and the narrative will be set in 2025, alongside her husband, Jack, and his biological daughters.
The story takes place 35 years before the existence of the girls, who, later, will be revealed the true identity of their daughters and the reason why they were separated in childhood.