Caramba and Henry by Marie-Louise Gay

From chapters.ca: Caramba's little brother Henry is a nightmare. He won't share anything, he squishes Caramba's favorite caterpillars and he screams all the time. But the very worst thing about Henry is that he is learning how to fly - much to Caramba's dismay - because Caramba is the only cat in the world who can't fly. Now Caramba can't keep up with Henry, who gets into all sorts of trouble. He tries to protect his little brother, but that only makes Henry unhappy. Finally, Caramba ties a string around Henry's waist and lets him soar like a kite. But when Henry breaks free... Marie-Louise Gay's beloved Caramba is back in this funny, sweet story about siblings.