Hmm...
Why do I get the feeling that he ratted out their dad to get him out of the way to thin out Dowun's camp?
I'm surprised Dowun isn't suspecting his own brother, but I guess he trusts their father even less. Don't know why, since their dad has no reason to hold a grudge or anything, unlike his brother.
Then again, their dad is an unreliable knucklehead...