I’m almost sure no one can sell a daughter except the father (Ein Adam Morish Zechus’e B’ito Le’bno), but the Mother & Brothers have the right to marry a girl under 12 off. She has the right at the age 12 to “undo” the marriage.
???????? ???? ?????? ?????? ???? ?????? ??? ??????? ?????? ???? ???? ??? ????? ???? ??? ???? (Keddushin 16b)