Timmy and Tommy

Timmy and Tommy are nephews of Tom Nook who run the upstairs area where furniture, wallpapers, and carpets are sold in Nookingtons from both Animal Crossing and Animal Crossing: Wild World. They attempt to speak in unison, but one always lags behind the other, causing one to repeat every last word the other one of them says. They are twins and both share resemblance to Tom Nook, even sharing some of his phrases. Apparently, from some discussions with Tom Nook, the two can be distinguished by a mole on one of their hands. Tom Nook also says that he adopted them because they took an interest in business life.

Roles in Animal Crossing Let's Go To The City/City Folk
In City Folk they run the first floor of Nookingtons, the fourth expansion of Tom Nooks businesses. When one of them speaks, the end of each sentence will be echoed by the other.