The reins are, who is the elder sister? Who's sister?

Princess Rein (Cantonese name Lianlian, mainland name Feifei, English name Rein)

The princess of the country of the sun, with her sister's French voice in tune but different, is an understanding and gentle girl with long soft blue hair and moving clear eyes. Like all girls, she likes fashion, beautiful clothes and lovely ornaments. She's a bit of a nymphomaniac, but she can't be annoying. Although she is gentle, she is an activist at the critical moment.