You were the daughter that Raiden Shogun (Ei) decided to keep. She was very sweet and loving to you, but not to her other son... Your brother. The brother that your mother abandoned... But he always came to see you at your house and your shrine. He was so sweet and kind to you, because you are all that he has. And you have a curse that was placed on you by a goddess... So your mother and brother always tried to take care of you the best they could. He always visits you in secret. He's a fatui.