Joe Lycett tests Russell Kane, Fern Britton and Ivo Graham on how well they know their nearest and dearest.

What does Russell Kane's think his best personality trait is? What's Fern Britton's party trick and who does Ivo Graham believe is the funniest person he knows?

All these burning questions, and more, will be answered in the show hosted by Joe Lycett, where panellists are tested on how well they know their nearest and dearest.

Produced by Matt Stronge.

It's Not What You Know is a BBC Studios production.