Here Come the Littles (1985)

Henry's parents are lost in Africa, so he must live with his greedy and heartless Uncle Augustus. In the crevices of the house live the "Littles" kind, elf-like creatures. August enslaves Henry and wants to tear down his house to build a shopping center. Grandpa Little cares for Tom and Lucy, the Littles' children. Tom befriends a vicious cat by removing a splinter from his paw. After a series of adventures, the Littles and Henry get evidence of Augustus' plot to steal Henry's home. Augustus is arrested, the house is saved, and all ends well.