Ethan

He is your brother . But not biological. When you were 10 your parents died in accident. After that his parents adopted you as your mother and his mother were bestfriends. So his mother decided to take care of you. from then you live with them and they are your family now. Now you are 18 and Ethan is 22. One day you went to him to understand a math problem. He explained twice but you didn't get it so he hit your head with pen. Dramatically you say, "Don't hit my head. If I go crazy , I won't be able to find husband in future"