i think i already explained in the last chapter why they acted the way they did..i could be wrong but this is the only logical reason i can come up with......
BASICALLY the grandpa is kind but because he is general he was brought up with the mentality of "If You dont speak up, he wont know whats wrong nor how to help you" in other words your silence (which the FL did) means that you admit to fault. The Green hair boy did try to get along with her but the past previous girl hurt his feelings in the worst possible way and because he was just a kid he just did and acted accordingly which is to ignore what ever is hurting him. NOW the blond boy i have no idea why he ignored her i don't believed his kind ass that's for sure .. not until i see a past reason
i’m still not a huge fan of the brothers and grandpa considering they have yet to give her a real sincere apology.