I have liked the article.

1)
Она любить мать. should be -> Она любит (свою) мать.

2)
Он и его сестра живут в Англии. – He and his sister live in England.
Though it will make the text more verbose, you could also add the construct:
Он со своей сестрой живёт в Англии.

(however, here "со своей сестрой" is not attributed to the subject, IIRC)

3)
Also there is "своё", used as a noun, with the meaning "something you own, and don't need to buy":
https://www.youtube.com/watch?v=R5PfDzs2WNY