The Littles

"The Littles are a family of tiny people who live in the Biggfamily's house. Mr. Little is only six inches tall, and he is big for a Little. The Littles develop a plan to get rid of the mice in the Bigg's house."@en
"An exciting adventure about people who are no more than six inches tall!"@en
"The Littles are a family of tiny people who live in the Bigg family's house. Mr. Little is only six inches tall, and he is big for a Little. The Littles develop a plan to get rid of the mice in the Bigg's house."@en
"Behind the walls of the George W. Bigg home live the Littles, a family whose tallest member measures six inches. The Littles get their living by appropriating whatever they need from the giants whose home their share. They earn their keep, though, by keeping the house's plumbing, electrical system, and so on in top operating condition. All is well until the Biggs go on an extended vacation, and rent their home to the Newcombs. The renters are terrible housekeepers. Soon, to the Littles' horror, the house is invaded by predators. Mice! Which from their viewpoint are enormous and dangerous beasts, as Granny and Uncle Pete have cause to remember from a similar invasion long ago. There's one thing worse than mice that the Newcombs could bring into the house. A cat to kill them. Which is, of course, exactly what the Newcombs do next...."
"The Littles, a family of six-inch high people who live in the walls of an old house, begin to worry when the new residents bring a cat."@en