Why didn Darth Vader sense Leia was force sensitive or even his daughter in Episode 4?
Serious Answer It is doubtful that Leia was originally meant to be Vader’s daughter. Rumours are that this plot point was only introduced after Episode 5. There are a lot of people who doubt that Luke was originally intended to be Vader’s son and Obi-wan Kenobi’s tale of Vader killing Luke’s father was the original story line. Fictional Answer Err… George?