Even though Yui is not their biological child, they still love her like their own child. Like bro, imagine if the child you love was taken away by someone who claims to be a "parent", I would cry for years.
What really gets me is that he had to have given up his parental rights for Jiu to get custody of her. Not temporary custody but fully giving up his rights. There’s no way he wouldn’t have heard when his ex-wife died yet he gave his daughter up to an uncle she’s only met three times.
It’s not fair of him to barge back into her life like this and try to take her back after she’s finally truly comfortable. And to America at that when her support system is in Japan it’s not a place Kaiser and Jiu will be able to visit easily. Just imagine the money and time. I understand he may have had a hard time but the way he’s going about this is terrible.
Well, I still want to slap Yui's father.. yeah I know he has his own reasons like being busy working for the family... but still, you indirectly neglected your child for years. Then when your child is comfortable with his adoptive family, you want to take her? You're so shameless!
Unless it's your child's own wish, I have no comment. But if the case is now, I don't even dare to ask for my child back. You can visit ur child often, give the affection that you haven't given before without having to steal your child from the family that already loves her.