Whittington by Alan Armstrong, illustrated by S.D. Schindler

From chapters.ca:
Bernie keeps a barn full of animals the rest of the world has no use for – two retired trotters, a rooster, some banty hens, and a Muscovy duck with clipped wings who calls herself The Lady. When the cat called Whittington shows up one day, it is to the Lady that he makes an appeal to secure a place in the barn. The Lady’s a little hesitant at first, but when the cat claims to be a master ratter, that clinches it. Bernie’s orphaned grandkids, Abby and Ben, come to the barn every day to help feed the animals. Abby shares her worry that Ben can’t really read yet and that he refuses to go to Special Ed. Whittington and the Lady decide that Abby should give Ben reading lessons in the barn. It is a balm for Ben when, having toughed out the daily lesson, Whittington comes to tell, in tantalizing instalments, the story handed down to him from his nameless forbearer, Dick Whittington’s cat – the legend of the lad born into poverty in rural England during the Black Death, who runs away to London to seek his fortune. This is an unforgettable tale about how learning to read saves one little boy. It is about the healing, transcendent power of storytelling and how, if you have loved ones surrounding you and good stories to tell, to listen to, and to read, you have just about everything of value in this world.