Changing the last name of the household

Thanks for all the replies, but aside from Sims PE, which I have but never really used, moving them out and back in won't work. For example, I had a family with the last name "Franklin". That entire family has been gone for a long time, and I can't remember if they all passed away or what happened with them. So now, the family that lives in that house now are the "Bryant's". When I moved the "Bryant's" out of the house and into the Sim bin, they are still showing the name "Franklin". I guess possibly I had a "Franklin" marry a "Bryant" but looking back in the family tree, there are no Sims with the "Franklin" name.

Edit: Ok, I was able to change the household name in SimsPE.