Jouons sous la pluie

Ria and Romy are thrilled to play in the rain with their grandma's permission, wearing raincoats and boots. Their friends join them, and they all enjoy wading through puddles. They then have a paper boat race in the water currents, with Mailly's boat winning. As thunder approaches, they head inside where Granny has prepared carrot pecans for them.

Who wins the boat race and what does their boat look like?

What does Granny have waiting for the children when they go inside?