You can't, unless you move each sim out individually and move in the one first whose last name is the one you want to be the household name.
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In the Sims 3 to change any ones name you go to city hall and select the option change Sims name and then you choose which Sims name you want to change.
you go to the town hall and click the change name option.
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no but you can switch households. you can do this by clicking edit town then clicking the household you want to switch to then clicking change to active household.
When all of your Sims in the household that you are playing have die the game will come up with a message that says something like "I'm sorry but all of the Sims in your household have died but that doesn't mean that you still can't use this house, you can still move in new Sims to this household"