UPDATE 1: There is no improvement between us. I did give him space and not talking to him, but he stills act the same. Even if my parents made him to ask my sister if she wants to eat something for breakfast, he won’t even budge or even ask. Same thing when we went to grocery stores. He always find a spot to hide and he is still unhappy when he is with us, even though we did normal thing and ignore him. When we ask him something, he stay silent most of the time. He is about to go back to school tomorrow and I hope that this is the final straw into our sibling relationship. If he is acting like this forever, then I am afraid that there is no more solution, rather than being patient and give him space. I will move back to Seattle to go back to college, hopefully this will relieves some “weights off his shoulders.” I will keep updating to see if there is any progress throughout next week.