A nice little idea I suppose. I just hope you can opt out of those annoying house carls or whatever they are called. Also I am going to assume that you can only adopt one of, what, 4 children that exists in the world? Not like there are many models for them in game.
Yeah, but it just looks like a mod with official support. To be sincere, I expected more. Dawnguard was ok, nowhere near like Shivering Isles or Bloodmoon, but it was OK.