Original: Once the circus is set up, Mrs. Jumbo loses her temper at a group of boys for making fun of her son, and she is locked up and deemed mad. Dumbo is shunned by the other elephants and with no mother to care for him, he is now alone, except for a self-appointed mentor and protector, Timothy Q. Mouse, who feels sympathy for Dumbo and becomes determined to make him happy again.
Simplified: Timothy Q. Mouse is a mouse who became the only friend of elephants Dumbo and his mother Mrs. Jumbo.