Three piglet brothers are determined to prove which one is the biggest.

Left in the care of his older sister, a boy begs her to read his favorite book but she is too absorbed in her own reading even to notice when a tiger comes to life in the steam from his soup.

A little girl thought that having a baby sister would be fun. But with a different daily routine at home, and her parents constantly distracted by the family's newest member, the little girl has a lot to adjust to. However, by helping her parents, and taking on special jobs, like singing to the baby, she learns that being a big sister comes with big rewards (though a little spit-up too).

More adventures at school and at home with Jake, a first-grader, and his older sister Abigail, known to each other as the Pain and the Great One.

After her brother tells her she is too little to play with him, Lulu, dressed as Ladybug Girl, makes her own fun.

When they hear a strange sound coming from the forest one night, Alice and Jack are scared but investigate it anyway.

Second graders Ethan and Ella are sad about moving away from their hometown to travel the world with their mom and dad, but before they go they have a mystery to solve.

When Splat the Cat hears that he is going to be a big brother, he tries to be the best one he can, even after his mom brings home a baby crocodile.

Lulu Atlantis is upset when her mother brings home little brother Sam, and she turns to her imaginary friend, Harry the daddy long-legs spider, for comfort, companionship, help, and advice as she is getting used to the addition to the family.

When his older sister Julie brings home two small wolf pups, Amaroq takes care of the one called Nutik and grows to love it, even though Julie tells him it cannot stay.