If I remember correctly there are two keys in his house. One from his cellar up on some beams and one behind some barrels. The good thing to do whenever you find a locked recipient is to look around, the key is always someplace near.
About the cellar near his farm, I'm not sure but I only found about it and opened it when I did the bandit quest (jailbreak). Maybe it's inaccessible for now?
Last edited by djin; 20/08/09 04:22 AM.