Prince Charming and Snow White teaming up with Rumpelstiltskin (on friendly terms) is a little hard to believe. They might all team up for a common goal–getting rid of Regina, trying to maintain order in Storybrooke now that magic is in the picture. But it is doubtful that Prince Charming and Snow White would ever trust Rumpelstiltskin–he created the curse in the first place, he tried to take Princess Cinderella’s baby from her, kidnapped Kathyrn, killed a fairy Godmother, and etc.
They would probably trust Belle, and maybe she would convince them to side with Rumpelstiltskin–I wonder if Belle has ever met Snow White, Cincerella, or any of the other characters of royal blood.