@Thea271 you have a fair point that he's being a two-faced wanker that's going with the flow
"do you want to go to america" "no, dad" "hey oogami i'm staying with you after all!" next fucking day "hey brother i'm going to america, want to come" "yes sis, let's sign up for everything now!" "guess what oogami, i'm a two-faced fuckwit and went back on everything i told you 2 days ago, tehehe!"
then again they're kids and kids do stupid stuff, and he's a very sheltered abnormal kid with a ton of baggage, but she should boot his wishy-washy ass to the curb, if he has so little willpower that he gets swayed like a windvane, he's going to be eternally a pushover