I think some people in the comments aren't thinking about the fact that the twins aren't seeing this the same way as we the audience is seeing things 😅
Then forget or don't understand the damage of trauma... And... It's not like they were that old when they died in their past life... Their brains weren't even fully developed at the age they died and it's not fully developed now either that decision making part of the brain 😅
And while I've never been abused thankfully... I can kind of understand their distrust. I have family that usually acts kind to my face but will lie about me behind my back, talk bad about me, or use me in some way to make themselves look good... My aunt and her husband for that reason amongst other things I also uncovered I just couldn't trust them again so easily. So I think of that like how the twins were abandoned, one brother said he knew of them but had no interest, and they heard their father and a brother talk about how he would have killed them before they were born and such. If it were me I would definitely not trust the father or any of the brothers. It would be very difficult to regain that trust... It's easier to give trust than to regain the trust if that makes sense.
As for with the Duke I can understand the thoughts of... "Oh he said something so kind that isn't typical of this society's belief system... Maybe... He's a good guy after all...? Maybe his son picked up his bad attitude towards them from the other nobles/noble children and his father will scold him properly for that." The Duke after all has only shown kindness towards the twins... He only shows his disgust with their back turned. And then I can't really fault them with being curious about speaking with someone who is in a similar situation to them. Having a support system is wonderful as it's difficult to talk about things to someone who had never gone through it. 🤔
Idk it's just my thoughts... I don't see the twins as being that stupid as the comments keep saying. Sure we all wish the misunderstanding is cleared up but I can't fault the twins too much on this... I blame the emperor for not properly discussing things with his kids... Ask them if they feel uncomfortable there or miss their mom/home. If they would like to return or whatever. Tell them what the other kid told you and that you are worried about them!