My Stepbrother is always bothering me and my stepsister is always arguing me or really annoying (Sbrother)) !?

Ahhh the joy of family.......I'm guessing there younger than you and they might grow out of it.......whenever they do that just be in control an show them they can't do that or tell them oh that nice for you but I'm using it you can whine and cry all you want but I need it do what you think there mom should do.....hope that helps :)