(SPOILERS TO CHILDES STORY!)
Childe would have a giant mental breakdown in front of Zhongli and since Zhongli doesn't really understand any emotions he kind of just awkwardly hugs Childe and sits on the floor with him between his legs trying to calm him down the best he could even though he didn't really know what he was doing
Teucer would definitely have his heart and soul crushed at that moment he would hate his brother even though he doesn't want to but he just feels like he has to because he was lied to for so long I feel like Childe would sit down with Teucer and try to calm him down and explain why he had to hide it from him but Teucer would just be crying so much to the point where he just doesn't even hear him over his sobbing and breathing
I feel like Teucer would when he's older ends up like his older brother Childe obviously but when he is fighting people in absolutely murdering their asses I feel like he would look up to the sky with blood everywhere and say something like "Big brother I'm just like you"
(I'll put a video credits to the person that made it but it's just the end of the song I can't find a shorter version sorry)
Childe definitely hates himself for becoming the way that he is but the only way he is like that is because he needs to protect the ones he loves and I know he hates it and he's trying so hard to hide it from his brother but if his brother were ever to find out Childe would probably do something that he would hate even more by hurting someone he loves
