Actually, in another RP POV, you can steal that feckin' sword!
Fight on Aldeth's side.... smoke the dryads in your crack-pipe. Then, before talking to Aldeth, pick-pocket him!
Make sure you save before, so you can go back and keep trying, but it works!! Damn funny too! Think about it... we just stole a Bastard sword from you, and we're holding it, but we did nothing wrong!

Anyhoo, yeah.. give it a try! I recall having to do the pickpocket thing a few times to get rewards that are rightfully mine.
- King of Hearts