When Max was about to move to Copper Canyon, they appeared and one of them catched a picture of Jim and Molly, and asked if that man was Max. Max denied and later gave some of his toys to them, specifically a plush to the girl, and an action figure to the boy with the purple blouse.
They are a group consisting in three kids, two being a boy, and one being a girl.
One of the used a blue striped shirt with blue jeans and black shoes. The other is blond boy that has a forelock, uses a purple blouse, brown jeans and black shoes. The girl has tied back hair, uses a yellow shirt with a illustration of a pink bunny, blue jeans and pink shoes.
Their heads were reused for other students later seen in the series. They also obviously got older features in their faces.