My sister asked me for help with class 9 algebra. I asked for twenty minutes to revise.

I work with databases all day, so in our family I am officially the maths person. Tonight my sister brought me a factorisation problem from her class 9 book. I looked at it, said I'd need a moment, and quietly opened a video in another tab. She noticed. She has since informed our mother that next time she will ask 'a real teacher'. In my defence, nobody has asked me to factorise anything since 2008.