in this story, the two sisters moved into the country side with their father, they found TOTORO under a tree beside their house, only good kids can see him.
meantime, a lot of unbelieveable things happened. One day, sister millet and her sister got into a small fight and decided to find her sick and hospitalized mother. But she got lost on the way, her sister couldn't find her so she decided to seek help from TOTORO.
TOTORO called the cat's train, she got on and found her little sister. On the train, the little sister gave the corn she picked to their mother, whishing her get well soon.
The movie TOTORO is about a normal girl wanting love from her family, hayao miyazaki used TOTORO and ficition, nothing fancy, everything is very natural, a bit sad, and even though TOTORO didn't say anything through out the movie and was hardly seen, he was still loved.
Also, don't forget about the train, those toys will always be taken home by somebody. i believe for those who watched TOTORO, they will understand that the feelings between these sisters is very deep.