Iam (small) in my family. my sister jane is (old) than me .cshe is (tall) than my mum. jane is (good) pupil in her class . but i think that im (smart) too. sometimes i get (good) marks than jane gets .

I am the smallest in my family. My sister Jane is taller than my mum. Jane is the best pupil in her class. But I think that I'm smart too. Sometimes I get better marks than Jane gets.

The smallest, older, taller, the best,  smart, better.