"First published in Great Britain in 2021 by Andersen Press Ltd."
Summary
After a fight with his little sister, Ravi wakes up with a Grumpy Hat and spends the day trying to improve his mood.
"Everyone knows that little sisters can be annoying! So when Ravi gets annoyed with Ruby and breaks her toy car in a rage, everyone goes to bed upset. Ravi wakes up the next morning with a bright red grumpy hat on his head! And he can't get rid of it, no matter how hard he tries ... Ravi learns how to swap his grumpy hat for happy socks in this uplifting story about siblings, family life and controlling bad moods"--Publisher's description