We can't drop a prince. Then we would be down to two. If we drop a princess it needs to be one of ours (not both) since we both are playing a Prince and a Princess, I don't really want to drop either as I like both of my characters however I would rather keep my Prince since I put more work into him than I did her. 

If you would rather drop your princess however, so you can focus on the King and your Prince better that might help to. But I am perfectly fine dropping Anna if you want to keep all your characters.