Use relative pronouns (who, whose, whom, which, that) and relative adverbs (where, when, why).

Relative pronouns have nothing to do with your Uncle Bob. 

Relative pronouns go a little further, so this substandard asks your students to know about who, whose, whom, which, and that. They also need to nail down their relative adverbs like where, when, and why.

Thankfully, no relatives were injured in the commission of this substandard.