It's twins vs. brothers in a series of messy challenges that include wet diapers.

Aim is the name of the game as best friends take on cousins in a series of challenges.

Best friends take on stepbrothers in a series of edible challenges.

Two teams compete in messy challenges of classic games, the water balloon and egg toss.

Siblings take on best friends in a series of tossing games.

It's buddies vs. besties in a series of wet, slippery and balloon-popping challenges.