Leslie Buffay is the second child of Frank Buffay Jr. and Alice Knight Buffay. Leslie is the middle child out of the triplets (her older brother, Frank Jr. Jr. and her younger sister, Chandler Buffay.) Her parents had trouble conceiving naturally (most likely due to Alice's age), so Frank asked his sister, Phoebe Buffay, as their wedding present, to be the surrogate of their child. Leslie was born, along with Frank Jr. Jr. and Chandler, in the episode "The One Hundreth".