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How do I get rid of a rat by myself?

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I have a slight problem... I have a rat But I dont know what to do about it! My brother plays on my playstation in my room and puts all his rubbish under my bed, but if I tell my mam, she will blame it on me! So how can I get rid of a rat, without spending a lot of money or getting a profession which would mean telling my parents? Also, I think it bit me the other day,I felt really sick and my head hurt a lot and then I found a red mark on my finger! Please help me!!!