When I was 10 years old, and my sister was 6 years old, in every day we will go for a run, playing in the garden and a one day I asked my sister climbing the tree. I feel a lot of fun, time to climb a tree and a jump, but my sister is afraid . I told her out of a tree I will jumped, but my sister ain't going out of a tree, she said she needed to play with me, but she didn't dare jump down, get me all riled up. So I yelled at her. It made her cry , and it makes me annoyed, so I pushed her off in the trees. I hurt her knee and leave a scar, this is my fault. I shouldn't yell at her, I don't think because I'm so furious I know I shouldn't be upset. - She was a kid, till now, I still don't apologize to her. I suppose I should have apologized