Regardless of the past, the og brother and father is already so late. You're unable to find your own child, they even keep dangerous person(The empress and their daughter?) still roaming around on the palace. If they want Shushu to return, they should discard the danger first. Now your child attached to another family and you want her to return to you without ASKING FOR FORGIVENESS FIRST? Bro child isn't some kind of possession, she have a right to be happy with her current family. Rather than immediately force her to return, you should slowly showing your love to them, giving a gift, letter, etc..
Regardless of the past, the og brother and father is already so late. You're unable to find your own child, they even keep dangerous person(The empress and their daughter?) still roaming around on the palace. If they want Shushu to return, they should discard the danger first. Now your child attached to another family and you want her to return to you without ASKING FOR FORGIVENESS FIRST? Bro child isn't some kind of possession, she have a right to be happy with her current family. Rather than immediately force her to return, you should slowly showing your love to them, giving a gift, letter, etc..