They really do. They get on each other's nerves and tease each other like any siblings... but they're also best friends, and know the best ways to help each other out.

[ Oh, ew, she has to touch the fish? Bleck. She digs in her belt, and pulls out her Dowsing Blade - since it's used more for treasure than to hurt others, she tries to do the same here, by swishing it around in the water to keep the fish away. ]