I don't think he'd consider it stealing from his family - they were his, in the day, still his by right. And from what you read in Dark, he still had lots left over that made Chloe drool. So, still staying in the Keltar line, will be passed down to their children.
And Dageus's honor - recovered and he's redeemed at the end of Dark. Yet, the knowledge of the 13 are still with him, so I'm betting it's a constant battle to be the "good" one all the time. Besides, that's Drustan's job! When it comes to anything to do with Chloe, aye, the honor's there. Anything else? He's as ruthless as any other medieval Highlander, I'm sure!