How did my sister break her arms?

Last Sunday afternoon, my parents let us to go down stairs to play. At first, my mother said Prisca couldn't not go down stairs for two weeks, but she refused to listen.

When we went down, my sister Prisca fought with Noah, my brother. Noah is also my best friend. Then my sister was fighting with my brother on the top of the slide and she wanted to push him down. I came up the slide and pushed her down instead. That was how she broke her arms. Next day, my parents took her to hospital and doctors put her arms in cast.

Later, my mother gave me hard canes and told me, as long as Prisca can not go to play, I also cannot go to play.

I am sorry for what I have done.