George, 5, will be a page boy in the bridal party, and three-year-old Charlotte will be one of six bridesmaids - the party also including Eugenie's older sister, Princess Beatrice, who will act as her maid of honor.
The full order of service for Princess Eugenie and Jack Brooksbank's wedding has been revealed by Kensington Palace.
The first of which is that she is to sit on Jack's family's side of the chapel during the ceremony.
Eugenie's big sis and BFF, Princess Beatrice and Jack's younger bro, Thomas - a sibling affair!
Channel Seven will broadcast the royal wedding on channels 7, 7TWO and live on 7Plus for viewers in Queensland, the Northern Territory and Western Australia who will be delayed due to Daylight Saving Time.
The venue is where Harry, younger son of heir-to-the-throne Prince Charles, Wednesday US actress Meghan Markle at a glittering ceremony in May and Eugenie is copying some of her cousin's plans for her big day.
Princess Eugenie and Jack Brooksbank have arrived in Windsor, where they'll say "I do" in less than a day!
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The royal family is paying for the wedding, but the anti-monarchist group Republic is lobbying Parliament to prevent any public money from being spent on security or other wedding-related costs.
(AAP) The wedding is being held at Windsor Castle.
Like Harry and Meghan, they'll then undertake a horse-drawn carriage ride through Windsor. "But there's something different about Friday's royal wedding, and people aren't happy".
According to Parker, Eugenie's ring wasn't meant to be a copy of Catherine's ring, which originally belonged to Princess Diana.
Similar to the Duke and Duchess of Sussex, the couple will invite more than 1,000 members of the public into the grounds of Windsor Castle to join their celebrations. This route is more comparable to that taken by Prince Edward and Sophie on their wedding day.