How to stop my brother from calling me 'Mom'?

i don't think you can stop it, my little brother and sister call me mommy and I live with my mom and dad, rumor go around school that I am a teenage mother too so I know how you feel! I would just try not to let it bother you, just tell people its your sibling and if they don't want to believe you they don't have to all that matters is you know that it is your sibling. my siblings know I'm their older sister but I am always taking care of them like you so they sort of see me as a second mommy. Its not too bad and they will eventually out grow calling you it and giving them a different name to call you will help. tell him (when he calls you mommy) say call me sissy or call me by you first name, don't tell him don't call me mommy give him a name to call you, I tell my sister to call my sissy and she calls me that more than mommy now! And if he hits you then hold his hang not too tight but so he can't hit you and get down to his eye level and say not mean or too sweet but firmly no hitting ok? most of the time when I do this to my little brother he always looks sad cause he is very sensitve and I will tell him after wards I love you and I don't want you to hit me cause it hurts your not in trouble just don't do it again and give him a hug, he doesn't do it as much as he used to though. I wish you the best of luck and don't stress to much about it and when he is yelling use the same teqnice as to get down to his level and say no yelling I can hear you when you talk in a normal voice, you don't need to yell to get my attention. if your dad lets you use a time out corner and say five minutes in time out and have his stay there until he stops hitting or yelling and his time doenst start until he stops and not giving in works too, tell him there will be more conciquesnces if he get up or doesn't sit down. only if your dad lets you do so though. try to be calm I know its hard but I have four younger siblings and its pretty hard for me so just be lucky its not that many you have to care for!