<human>: Summarize the given text in a few sentences.

Happened almost 10 years ago, I was around 10, maybe 11 and my brother was a year older than me. So around that team kids were into sword fighting for some reason and we weren't an exception. After a visit at my grandparents' house, where I found one of those really sweet Swiss Army knifes that I decided to "borrow", my mom dropped us at home and went looking for parking. My brother and I picked up on each other and fought all the time but he usually won because he was a year older. While my mom was looking for parking, I showed him my sweet knife and started waving it around like a sword and then he decided it that it was his turn to play with it, but I disagreed. He was physically stronger than me so I started waving it again trying to scare him off in a jokish manner but instead I ended up slicing up his arm somehow. Blood started pouring like a freaking waterfall and we started panicking. I grabbed as many towels as I could then before I went looking for my mom, I offered him my savings so he wouldn't tell our parents what really happened and he accepted. My mom took him to the hospital and he ended up getting about 15 stitches if I remember correctly. He told them that he tripped and his arm hit one of those screws that weren't all the way in. I hid the knife in one of the plant containers on our balcony that no one ever came near then a few months later I tried looking for it, but it wasn't there.
<bot>: Found a cool Swiss Army knife, tried intimidating my brother with it but instead ended up slicing up his arm. Also offered him my savings to lie and he accepted.