Please, this fight is silly and I think there's no need to really argue on whatsoever is going on...
As for you Kris, the end of your quest is simple ! The necklace is in a safe not far from the grandmother and grandfather (just a bit west of them maybe, that's where i found it). Just look around just a bit
And finally, i found a really good translator if you have a problem with a quest:
http://www.ocn.ne.jp/translation/
Put your text in the first box, then check the second radio button that is just over it, and click the upper text box in the middle. It's so far one of the best translator i've found on the net.