Here are several read-aloud books for children that include themes related to siblings:

• Charlie Makes a Splash by Shane W. Evans, Holly Robinson Peete and Illustrated by Shane W. Evans. The story for ages 4-8 centers on  siblings Callie and Charlie. Charlie who has autism, finds solace and empowerment in pools, ponds, sprinklers, visiting the aquarium, and swimming in the ocean.
•  The Perfect Shelter – A Children’s Book about Sibling Illness by Clare Helen Welsh and Illustrated by Åsa Gillan.
• Terrible Horses by Raymond Antrobus, features sibling who argue and fight.

For older children: Squished by Megan Wagner Lloyd & Michelle Mee Nutter. This story features 11-year-old Avery Lee who loves her neighborhood, school, and the end-of-summer fair she always goes to with her two best friends. But she’s tired of feeling squished by her six siblings!