What is the relationship between Princess Yaya and Princess Beibei?

The characters in the animation "Miracle Dance of Balala", "Magic Test of Balala" and "Dream Melody of Balala". The little princess of Gemini, the twin sister of big princess and supreme leader Yaya. Good at singing and dancing, beautiful and lovely, lively and kind, he is the lead singer of dream angel. The heart grows on the right, and there is a noble Gemini mark under the left shoulder. In order to save Gemini captured by Queen Harry, Beibei came to the human world with the night star box in an airplane (glistening). Have the ability to collect stars (dance with Maggie Michelle, sing the star diamond spell and get the star diamond). I miss my sister very much. Whenever I hear Princess Yaya talking to herself telepathically, my head hurts. Accompanied by her sister's telepathy, help and encouragement, and with the help of all the magical fairies, Beibei used her sister's powerful Gemini power to deal with Sirius and the serpent, found twelve star diamonds with light, strength and hope, and saved her sister Princess Yaya and the whole Gemini.