Charles will take the place of Markle's father, who was unable to attend Saturday's ceremony. Thomas Markle originally was supposed to walk his daughter down the aisle, but underwent heart surgery on Wednesday.
Markle's mother, Doria Ragland, landed in England on Wednesday and met with several members of the royal family. She is scheduled to have tea Friday with Queen Elizabeth II, Prince Harry and Meghan Markle, the Daily Mail reported.
Ragland, 61, was introduced to Prince Charles and Camilla, Duchess of Cornwall on Wednesday, as she was invited for tea at their London home, People reported. Ragland also met Prince William; Kate Middleton, the Duchess of Windsor; and their three children.