William talked about helping his kids with their Maths work during a documentary on mental health.
Over the years, the four younger royals have led the way by speaking about their own mental health.
Like so many people, the singer is having good days and bad during amid coronavirus pandemic.
While we are physically distancing ourselves from others, some may find themselves drawn to darker characters.
Children are spending unprecedented time with their parents, which could lead to separation anxiety when lockdown is lifted.
'You are not completely powerless and can slow down the process enormously if you pull yourself together, eat disciplined and exercise a lot.'