Was the Skyrim Intro dialogue ever changed?
Skyrim was released in 2011 and I played it when it was new.
I turned it back on recently and watched the legendary Hey you, you're finally awake opening scene. The player character is tied up on a wagon with Ulfric Stormcloak, a Stormcloak soldier named Ralof, and a horse thief named Lokir.
Lokir: Damn you Stormcloaks. Skyrim was fine until you came along. Empire was nice and lazy. If they hadn't been looking for you, I could've stolen that horse and be halfway to Hammerfell. You there. You and me - we shouldn't be here. It's these Stormcloaks the Empire wants.
Ralof: We are all brothers and sisters in binds now,
The and sisters part sticks out at me. Was it in the original script? Or is it an edit since the game came out?
It is appropriate since the player race/gender is not decided at this point. Of course if you decide you're playing a man the line then sounds strange. It would make more sense to edit the horse thief to be a woman. That way Ralof is referring to himself, the horse thief and my undetermined friend over here. . . .
Solution 1:
As videos of the Skyrim intro such as this one easily prove, the dialogue on launch day was exactly as you quoted it in the question.
Solution 2:
Brothers and sisters are fitting seeing that on the other carts there are female prisoners. And as Wrigglenite stated in his answer there is a video that shows it was always intended to be so.