What really bothered me was not the bugs I encountered but the fact that the kids were completely oblivious to the fact that they had just been attacked and that their mother was kidnapped. When I approached them after killing the bandit and taking the ransom note they wanted to play a game or ask me for a present. It was business as usual.
Could Bethesda not get an extra few lines of voice acting done? I think Hearthfire is a good DLC overall but it could benefit from more voice acting especially for the spouse and kids. I've never seen the kids interact with the wife. They just kind of coexist and that's it.