The Duke and Duchess of Cambridge and Duke and Duchess of Sussex will join together to remember all those who have lost their lives in conflict.
The foursome will join the Queen and other senior members of the family at the annual Royal British Legion Festival of Remembrance.
It will be the first time the younger royals have appeared as a group since Harry and Meghan admitted they are struggling with public life in an emotional TV interview.
It will also be the first time the brothers have been on a joint engagement after Prince Harry addressed reports of a rift and admitted they were on ‘different paths.’
The ITV interview with the Sussexes was a marked departure of the royal family’s traditional stoicism with Meghan appearing on the verge of tears.
Talking about press scrutiny, the former actress said: ‘Any woman, especially when they’re pregnant, you’re really vulnerable.
‘So that was made really challenging and then when you have a newborn – especially as a woman, it’s really, it’s a lot.
‘So you add this on top of just trying to be a new mum or trying to be a newlywed.’
She also thanked interviewer Tom Bradby for asking how she is coping, saying: ‘Not many people have asked if I’m OK.’
Prince Harry also opened up about the ‘festering’ grief he still feels over his mother’s death and how he is haunted by memories of her relationship with the press.
The ITV interview came after months of scrutiny about the relationship between William and Harry after they split their households.
Harry admitted they have ‘good days’ and ‘bad days’ but added: ‘We are brothers. We will always be brothers.
‘We are certainly on different paths at the moment but I will always be there for him as I know he will always be there for me.
‘We don’t see each other as much as we used to because we are so busy but I love him dearly.
‘The majority of the stuff is created out of nothing but as brothers, you know, you have good days, you have bad days.’
After the interview, William was said to have expressed concern that Harry and Meghan were ‘in a fragile place’ while Kate has reportedly phoned to check on her sister-in-law.
Prince Charles and Camilla will also join in today’s service at the Royal Albert Hall, which is hosted by the Royal British Legion and commemorates all those who lost their lives in conflicts.
The Duke of York, the Earl and Countess of Wessex, the Princess Royal, the Duke and Duchess of Gloucester, the Duke of Kent and Vice Admiral Sir Tim Laurence will also be there.
This year’s event marks 75 years since notable battles of 1944 including Monte Cassino, Kohima and Imphal, D-Day and the collaboration of Commonwealth and Allied forces.
It will also celebrate the 100th anniversary of the Government Communications Headquarters and pay tribute to RFA Mounts Bay which delivered supplies and aid to the Bahamas after Hurricane Dorian this year.