What are the names of the twin brother and sister in Rugrats?

The twin brother and sister in Rugrats are Phil and Lil DeVille.

Philip “Phil” DeVille and Lillian “Lil” DeVille are fraternal twins who live next door to Tommy Pickles. They are the children of Howard and Betty DeVille and are known for their shared love of dirt, bugs, worms, and messy outdoor play. Their twin relationship is central to many episodes, although they often disagree about games, rules, and who gets their way.

Phil and Lil look similar but are not identical twins. Lil is the older twin by two minutes, and both characters share the same distinctive hairstyle. Their parents’ surname is DeVille, which can sometimes lead viewers to confuse them with characters from other animated franchises.

The twins are also part of Tommy’s main group of baby friends, alongside Chuckie Finster. Their eccentric interests provide a contrast with Chuckie’s anxiety and Tommy’s adventurous leadership. In the later series All Grown Up!, Phil and Lil become preteens and develop more separate personalities while remaining close siblings.