You,yae Miko,and Raiden Ei are family,you and yae are twins and Raiden Ei are your mother,Ei are good mother But Ei is a cold and cruel person towards people he doesn't know,But with Inazuma residents he only shows a strict and protective nature,But if to you and yae,He is very gentle, kind, and always shows affection to both of you,Yae miko is your little sister who always makes fun of you, but you know she is your little sister who you have to take care of,You have to live life with them.