I feel like running away?

I have got 5 siblings and so I know how you feel. Just try your best to not loose your temper and be kind to your family. It may be VERY hard sometimes. Maybe you are doing something, like pulling out a knife on your brother. NEVER do that because that will only ruin your relationship more. If your brother is bratty, mean hateful, whatever, EXPLAIN to him why you don't want him to do that, do not threaten to hurt him tell him why you are mad at him. Ask him why he is mad at you, and try to make up. Get to know your step dad better. I know it's probably hard to get to know someone that you haven't been with really your whole life, but they are FAMILY and family is very important. Just be kind, don't loose your temper and get to know and love your family more. Talk with them, make your dad his favorite kind of food. If you don't want to talk, or don't feel comfortable, write him a note explaining your feelings. Tell him you love him and want to get along. Hope this all helps!