Prince William
Prince William, Duke of Cambridge (C) meets charity representatives as he attends The Cinema and Television Benevolent Fund's Royal Film Performance 2015 of the new James Bond 007 film "Spectre" at Royal Albert Hall on October 26, 2015 in London, England. Reuters/Chris Jackson/Pool

Correction, Thursday, 11:47 p.m. EST: A previous version of this story reported that Prince William supported SportsAid and SkillForce while Princess Kate was a patron of Place2Be. This has now been corrected to show Princess Kate supports SportsAid and Place2Be while Prince William is a patron of SkillForce.

Prince William attended the annual holiday concert for one of his favorite charities held in London Wednesday. While Princess Kate was not in attendance, however, her mom and sister, Carole and Pippa Middleton accompanied Prince William to the event.

Christmas carols were played during Wednesday’s annual holiday concert, which was attended by Prince William and was held to benefit the Henry van Straubenzee Memorial Fund, People magazine reported. The memorial fund was established in memory of the royal brothers’ friend Henry van Straubenzee, who died in a car crash 13 years ago. The charity is one of Prince William and brother Prince Harry’s favorite causes, in fact, both are patrons for the organization.

In a statement prepared by the two royal brothers, which was written on the event program, Prince William and Prince Harry stated that they are “delighted” with the honor to be patrons of their friend’s memorial fund. "Each year brings with it more news about the progress that this charity continues to make," the statement continued. “This is largely down to the generosity and support of donors, many of whom are here tonight at this, the seventh Christmas carol service."

Apart from the Duke of Cambridge, two of Princess Kate’s family members also attended the festive holiday event, namely mom Carole and sister Pippa. According to People, the Duchess of Cambridge stayed at home to care for children Prince George and Princess Charlotte.

Meanwhile, December will continue to be a busy month for Prince William and Princess Kate. Aside from holiday preparations, the royal couple are set to attend various engagements prior to Christmas. One would be Prince William’s visit to Birmingham on Dec. 7, Birmingham Mail reported.

The prince is expected to attend a special peace football tournament at Saltley Academy, as well as meet the people behind the project Football For Peace. He is also set to visit the Bournville College to learn more about The Diana Award’s anti-bullying work.

Another event that Prince William will attend this time with Princess Kate is ICAP’s annual charity affair on Dec. 9, where the royal couple is set to take the trading floor manning phones to close deals with clients.

The event will benefit three of the royal couple’s charitable organizations, including Skillforce of which Prince William is a patron, as well as SportsAid and Place2Be where Princess Kate is a patron.