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What to do when your sister is acting like your mum?

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Well my sister is 20 so 2 years older than me and from the age of 16 shes tried and acts like my mum when my mum is even in the room and now its started to annoy me as I only have one mum but my sister is acting like my mum tooo. And I know my mum really welll as im likr her 90% and the words my mum uses my sisster uses and what can I do as I dont like it when my sister acts like mum. What can I do to change this ?