Answer:
Dear Doodle,
I understand that you cannot walk and you haven't been able to go to school either and i feel sorry for you and ashamed of myself. I know you'll never be like the other kids but you are still the same Doodle inside your heart.
Love,
Your beloved Brother
Step-by-step explanation:
Brother is ashamed of Doodle because he cannot walk, nor has he progressed enough to be able to attend school. Brother decides to teach Doodle how to walk and prepare him for school. Doodle does learn to walk, but he will never be like the other kids.