Plus, Chi and Blackie get to see each other again in Chi's New Address! Squee!
Chi's determination to go back home after being separated from her mother can cause some tears. She's also come very close to reuniting with her mother a couple of times but never quite makes it.
There are also hints that Chi's mother and, therefore, her kittens have an owner that might like to know what happened to her lost kitten. It can be very disheartening to see for someone who has lost a pet.