1. Bluebelle was carried by the Queen, but she is still biologically related to both of them.

2. In the beginning, the King disliked Bluebelle because she was born after his divorce. However, Bluebelle wants to be a princess, so the King has learned to tolerate her presence. Now, he appreciates her willingness to learn about royalty.

3. Bluebelle is larger than the Prince. The Prince was a prematue baby, so he's smaller than the usual Cosmic child. Bluebelle is healthier, which makes the King feel insecure about his bloodline.