It's great that the baby pigs have an older pig to show them the ropes of being a guinea pig. Fuzzy teaches them how to groom, where to sleep, how to ask for food, and also keeps them company. Guinea and Fuzzy had to grow up without an adult around, but they turned out well.
They never learned to be properly potty trained. But my theory is that's because their original cage was so small. Potato and Bean are, and Fuzzy certainly didn't teach them.