Big bright feelings

A young girl named Ruby discovers a Worry, and while it's small to begin with, over time the Worry and grows and grows. Then she meets a young boy and learns that everyone has worries, and with the boy's help, she learns to control her own.

"Tired of missing out on good things because he is the smallest and youngest in his family, Ravi turns into a tiger and gets what he wants with a great roar"--Provided by publisher.

After Finn tells his grandmother a fib, his lies continue to build up which makes Finn feel horrible until he builds up the courage to come clean.