In which animated Disney film would one find the characters Si & Am?

Si and Am are the central antagonists from Disney's 15th full-length animated feature film, Lady and the Tramp. They are a pair of twin Siamese cats who seek to cause trouble, eat others' food, and incriminate the dog.

They were both voiced by the late Peggy Lee in the original film, the late Mary Kay Bergman (Si) and Tress MacNeille (Am) in Lady and the Tramp II: Scamp's Adventure, and both by Tress MacNeille for House of Mouse and Mickey's House of Villains after Mary Kay Bergman's death.

Si and Am first appeared when their owner, Aunt Sarah, comes to babysit the Brown's new baby. The two emerge from the picnic basket Sarah carried them in, introducing themselves to Lady, then immediately roaming the house, claiming they might "stay for quite a while". They begin destroying the house, tearing up curtains and wrecking furniture. They try to eat the family fish and bird, but Lady comes in to scare them off.