I know someone who...

Relatives Review on this blog

Relatives who, which, that, when and where in jokes

Practise:

ISL COLLECTIVE

Lots of online Practice for 4º ESO: Bon Tips, Ejercicios de inglés

Let's have fun with English Games

10 Important Events in US History (Relative pronouns)

More activities via All Things Grammar

Eg. Choose the correct Pronoun (including Whom)

Who or Whose?

Rewrite using WHOSE

Extra!
B1 Reading  Are you a good friend?
B1 Listening: Important people