a mark in my laptop

over 13 years ago

It’s been about 5-6 months since i’ve brought my laptop and i don’t like it when people touch it but i still let my sister and brother use it to do their homework sometimes even though we have a computer. And it was few months back i found a long scratch and even today i found one in the outside part. I just got so angry because i know it wasn’t me. Who was it?