Prince William and Kate, with Prince Charles and Camilla, carried out a rare joint engagement on Tuesday.
The royals visited the Defence Medical Rehabilitation Centre to meet patients and staff. The centre helps some of the most seriously injured members of the British Armed Forces, while also helping to return those who have been injured in the course of training to work.
The Duke of Cambridge played a game of wheelchair basketball. "Sixth time lucky," they shared after William eventually got the ball in with a little help from The Prince of Wales.
According to People, there was also a bit of banter between the father-son duo.
Because all four of the royals were present, William cracked an unexpected joke, which, coming after the royals have reportedly decided to slim down the family, a lot of people found especially funny.
"When there's four of us it's a nightmare," the Duke of Cambridge said. Prince Charles agreed, quipping, "There's too many of us!"
The Prince of Wales later also joked with reporters that they'd have to be on top form "with so many of us running around".