- Princes William and Harry and the Duchess of Cambridge talk about mental health in a video released Friday
- Addressing his mother's death, William said "it's very easy to run away from it"
- The conversation was part of the Heads Together campaign, which aims to end the stigma around mental health
(CNN)It is rare for the Duchess of Cambridge, wife of Prince William, to speak candidly on film. But in a video released Friday, Kate talks openly with her husband and Prince Harry about mental health and the importance of discussing mental wellbeing.