Little Dino was at the beach for the first time. She was fascinated by the sand and wanted to build a grand sand castle. However, she didn't know how.

She tried piling up the dry sand, but it kept collapsing. Frustrated, she sat down, her tiny tail tracing patterns in the sand.

Seeing his little sister upset, Big Dino walked over. He was older and knew a lot of things, including how to build a sand castle.

With a kind smile, Big Dino explained to Little Dino that dry sand can't hold shape. 'We need wet sand, sis,' he said, leading her to the water.

Big Dino filled a bucket with water and dumped it on the dry sand. Little Dino watched in awe as the sand transformed.

'Now, let's build our castle,' Big Dino said, his eyes twinkling. Little Dino nodded, her excitement returning.

Little Dino and Big Dino worked together, shaping the wet sand into towers and walls. The sand castle began to take form.

They worked tirelessly, their laughter and chatter filling the air. The castle grew bigger and more magnificent with each passing minute.

Finally, the sand castle was complete. It was grand, just as Little Dino had imagined. She couldn't contain her happiness.

Big Dino looked at his little sister's happy face and felt a wave of pride. They had built the sand castle together.

Little Dino thanked Big Dino for teaching her how to build a sand castle. They admired their creation, their hearts filled with joy.

As the sun began to set, the two dinosaur siblings sat by their sand castle, their bond stronger after their shared adventure on the beach.