Seven Little Monsters (2000)

When Four wins his brother Five a pet turtle at a fair Five and the turtle share a bond and become inseparable. Five even names the turtle Sam and goes as far as to give knit him a sweater, but during a bath time mishap Five thinks that Sam has gone down the bathtub drain. Five and his brothers and sisters explore the city drainage system to find Sam. When the reach the end of the line at the ocean they think that Sam has gone to his final reward. The family hold a memorial service and Five tries to deal with the loss. It isn't until they realize that Two is missing from the memorial service that they find out what really happened. Sam had fallen out the window and had climbed back in. Five and the others find him on Two's stomach. Two ended up with his nose stuck in the bath faucet and with no one to help him out he had simply fallen asleep.