It's a family affair! Kate, William and Harry are among three generations of royals at the Commonwealth Day service in the year of the Queen's 90th birthday

It's a family affair! Kate, William and Harry are among three generations of royals at the Commonwealth Day service in the year of the Queen's 90th birthday

• Kate tells schoolchildren that 'it's hard to keep up' with Prince George as he races around on his Micro Scooter - but Charlotte keeps him in check
• Shades of grey! Kate wears a muted £2,500 Erdem coat and matching hat by Princess Diana's favourite milliner for Commonwealth Day

The three young royals were seen smiling and laughing with one another (right) as they arrived at Westminster Abbey alongside the monarch (left) for the rare joint public engagement, one of the highlights of the Queen's calendar. The Duchess of Cambridge looked resplendent in a £2,500 grey coat by Erdem and an unusually large hat by 90-year-old John Boyd, a new milliner for her. Prince Andrew, the Queen's son, also joined in with the family affair. The service, the largest inter-faith gathering in the UK, is being broadcast live on BBC One for the first time in celebration of Her Majesty's lifetime commitment to the unique 'family' in this milestone year. As head of the 53 nations, the Queen sees the continuation of the Commonwealth as one of the greatest achievements of her reign and is keen to pass on her enthusiasm for it to her grandchildren.