Worst thing I ever did... telling my brother I didn't need his gifts! I was an unappreciative brat when he was just being a loving older brother. Oh, how I regretted saying that because immediately I saw the hurt in his eyes. He only wanted to give me things because he loved me. That's the worst thing I have ever done to a sibling.
Worst thing a sibling did to me... I won't say it on here. Let's just say I don't feel the same way for my older sister anymore.