Mandy, you missed my post
Originally posted by jokemaster
I read somewhere that if someone lives in dark areas for too long they develop better sight in the dark, but OK, then instead: Can be among humans undetected for more time than any other vampire, IE can act like a human more than anyone else.
Curt-man and I did agree about the storyline, and I read it in band of brothers where the soldiers claimed they saw better in the darkness because of their training. And the streets thing was just to let you know that he was tough before he became a vampire.
Vader's wife was very pregnant when she died 19 years ago. All of a sudden a 19 year old who is very strong in the force and has a distinct resembalance to him in his younger days rolls in from Vader's home planet with his old Master Obi-Wan (Who was the ONLY other person preset at the time his wife died. And to boot, the kid's last name is Skywalker.
So in answer to your question, he knew Luke was his son because his name is Darth Vader, and not Darth Retard.
-Forum post on why Vader knew Luke was his son.