The fund supports schools in rural Uganda, and Harry and Prince William have been patrons of the organization since 2007.
Prince William and his wife Kate Middleton, the Duke and Duchess of Cambridge, will attend Christmas functions at Sandringham with the Duke and Duchess of Sussex, Prince Harry and his wife Meghan Markle, respectively.
The alleged ongoing feud has been a hot topic as British publications continue to report that Kate and Meghan's relationship is strained due to Meghan's "disregard for royal protocol" and her "opinionated and dictatorial" personality.
MEGHAN Markle has been pictured for the first time amid escalating rumours of a rift between her and Kate Middleton.
Earlier the duchess had chatted to Barrie, 72, and Ann Macdonald, 70, from Manchester who are looking after their five-year-old grandson Harry while his parents are deployed overseas at Christmas.
Pippa Middleton and James Matthews Instagram @fromberkshiretobuckingham
The latest news comes after reports last week suggested Harry thought William wasn't doing enough to welcome his then-wife-to-be into the family last Christmas. And that's why she's the ideal woman to give Meghan a little heartfelt advice.
The couple are expecting their first child together around the end of March or beginning of April.
Harry used his address to the congregation to highlight the work the charity does for young girls and getting them into education.
'It's the best of both worlds in that they can take part in all the festivities at the big house, while retreating into their own space when needed.