This is a short book, but it is full of SEL wisdom. I like how well the boy deals with his sister's tantrum and also that it takes multiple techniques to calm her down. Each tool makes her a little bit calmer, which the book shows visually by having her shed a layer of her suit. The tools vary from squeezing a toy to a mindful breathing exercise. This is a great book for children--especially those with toddler siblings!
Allie All Along by Sarah Lynne Reul