I had (have) the same problem growing up as 1.the only male and 2.the only person that knew one end of a screwdriver from the other in the house, so I feel your pain on this. First question do you still live at home? Second have you explained to your sister that you or someone else won't always be there to help her with these things? If you answered yes to the first question, get out of there, you're only aiding their dependence on you. At some point you have to let them fail. Not to make you look better, but because failure is the ultimate teacher. It's like my dad likes to say "I don't make mistakes, I just provide myself with multiple learning opportunities on a daily basis".
It seems like your sister is dependant on situations such as this to get attention from your mother, and mainly from you. You need to sit down and talk with her. Seems like she 'needs' to have you around to help her, but you have to ween her of this dependence.
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"Two roads diverged in a wood, and I-
I took the one less traveled by,
And that has made all the difference." - Robert Frost
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