Show two children (both male) lying on the grass under a big oak tree

Show two children (both male) lying on the grass under a big oak tree, looking up at the sky. The sky should be bright with fluffy clouds, and both children are smiling, enjoying their time together. I want it to be a children's book art style. Keep their clothing simple. Use soft, calming colors that matches the sad atmosphere. The illustrations should balance between sadness and comfort.