Who is Fudge Hatcher from Fudge-a-Mania and what is their importance?

Fudge Hatcher is Peter's five year-old brother. Fudge's real name is Farley Drexel Hatcher, but he does not like being called by it. Fudge is an innocent troublemaker. He is a handful and he has a lot of energy. He is curious and creative and these qualities get him into troublemaking situations. He asks a lot of questions about how the world works. He is curious about knowledge. He loves to play with Peter and Tootsie. He likes sharing a room with Peter. He falls asleep though before they can ever talk.