Prince William and Kate Middleton hosted a Christmas party, but they didn’t take their kids to the event.

On Tuesday, the Duke and Duchess of Cambridge celebrated with the families of the Royal Air Force personnel who will be separated this holiday. Over 200 spouses, children and parents of servicemen and women enjoyed a day of activities at Kensington Palace including chocolate truffle making, Christmas card decorating and party games.

Since the party was for families and kids, one asked the Duke of Cambridge why he did not invite his own kids to join the festive engagements.

“Because I can’t do this and look after the children,” Prince William responded.

Prince William and Middleton mingled with the families. At one point, the duchess even joined a snowball fight. Middleton also gave a heartfelt message during the celebration.

“As someone whose husband has served, I know how hard it feels when a loved one leaves home to do the job they’ve trained for. When William served in the Falklands or went search and rescue, I remember how it felt,” Middleton said

“But I can’t imagine how it feels when your loved ones are away on active service over Christmas or at those special family moments,” Middleton continued. “The absence of people you love must be especially hard at this time of year. We should never forget our military families and all the service you do for us all.”

Aside from the party they hosted in the palace grounds, the Duke and Duchess of Cambridge are expected to host another one in Cyprus. Both events aim to support the deployed military personnel and their families who will be separated over the holiday season.

"The party will feature stalls where children can decorate stockings, make snow globes and craft Christmas crackers. There will also be a photo booth and post box at the event for attendees to send personalized messages to loved ones serving in Cyprus," Harper’s Bazaar reported.