Well... Buddy, just let it go, let it go...
On the other hand, since my memory sucks, does he know for sure the the Sun witch was the one that killed his parents? Or does he just want to kill her because she was a major cause for the loss of the war? I'm honestly not too worried about him finding out her identity at this point because I think even if he knew her identity he can see that she isn't the person he thought she was (ruthless/evil or whatev.) But I'm sure when that time does come, there will be melodramatics.