The statement reads: "All three siblings of Diana, Princess of Wales will be in attendance and Lady Jane Fellowes will give the reading".
At the wedding, the royal couple also plan to honour the memory of the late Princess Diana, Harry's mother, who died in a Paris auto crash in 1997. Diana divorced Prince Charles in 1996 and tragically died in a auto crash in Paris, France at the age of 36 the following year.
The Duke and Duchess of Cambridge's third child - Prince Louis of Cambridge - will not attend the nuptials.
Some 610 members of the Windsor community, 530 employees of the royal household and pupils from nearby schools are also invited to join the celebrations in the castle park. The newlyweds will attend their first royal engagement together a week after the wedding, the palace said.
It had not been known what role Ms Markle's parents would play in the wedding.
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Priyanka Chopra visited "Watch What Happens Live" on Thursday, and host Andy Cohen made a decision to take advantage of the "Quantico" star's close friendship with Meghan Markle. "Her own father didn't get an invite, whom should be walking her down the aisle".
Ms Ragland, who is African-American, met Mr Markle on the set of the USA soap General Hospital, where he worked as a lighting director, when she was a temp in the studio. "Ms Markle is delighted to have her parents by her side on this important and happy occasion". On the morning of the wedding, Ms. Ragland will travel with Ms. Markle by auto to Windsor Castle.
Meghan and Harry will not depart for their honeymoon immediately after the wedding.
"After the service has concluded, the newly-married couple will proceed out of the church and acknowledge the 200 representatives of Prince Harry's charities gathered in the Cloister".
Tens of thousands of well-wishers are expected to cram into the medieval town of Windsor on the day of the wedding, though the most they can expect to see (apart from on public TV screens) is the couple's carriage procession after the wedding.
The bride's parents will fly to London the week before the wedding to meet the Queen, the Duke of Edinburgh, Prince Charles, Camilla, Prince William and Kate Middleton. He said in his rant that Meghan will make a joke of Prince and the royal family.