A story of a young girl and boy who through their adventures discover their own strengths and weaknesses. And in the end, what matters most, is the bond they share with one another. Excerpt: There once was a rabbit, whose nickname was Yabut, but really his name was Fred. His nickname was Yabut, because of his habit, of saying "Yeah, but" before most things he said. Now Yabut the Rabbit had lots of friends, but his best friend was Darla the Squirrel. A great many folk, made many a joke, because Fred's best friend was a girl.

Life changes of the Muttmulligans is the third Muttmulligan book. The first book featured little brother' temptations and heroics, and the second book followed little sister's encounters with some very unusual creatures. This third book tells about their adjustments to their new siblings, and some harrowing moments caused by their curiosity about changes going on in their neighborhood. There is a moral to the story.