|Family|| Betsy (Sister)
|First Appearance||"The Implant"|
|Portrayed By||Kieran Mulroney|
Timmy is the brother of Betsy, George Costanza’s girlfriend in “The Implant”. He catches George double-dipping a chip and chastises him for it. George defies Timmy and double-dips again. Timmy then picks a fight with George. As a result, Betsy breaks up with George.