Many members of the extended royal family are expected to attend the royal wedding of Peter Phillips and Harriet Spurling, but one relative is likely to be absent.
While the guest list has not yet been confirmed, King Charles, Queen Camilla, and the Prince and Princess of Wales are expected to join parishioners at All Saints' Church in Gloucestershire on Saturday, June 6.
However, the guest list will likely not include one of the groom's half-sisters, Felicity Tonkin, the little-known daughter of 77-year-old Captain Mark Phillips and half-sister of Peter and Zara Tindall.
Princess Anne's marriage to Captain Mark ended in divorce after reports of infidelity on both sides, and the couple separated in 1989. She is now married to Sir Timothy Lawrence.
In 1991, it was also confirmed that Captain Phillips had fathered a daughter, Felicity Tonkin, in August 1985 in New Zealand with art teacher Heather Tonkin, while he was still married to Anne.
Felicity Tonkin is Zara and Peter's half-sister (Simon Runting/Shutterstock).
Trying not to attract unnecessary attention to myself
Although 40-year-old Felicity was born just four years after Zara, it is believed they did not keep in touch.
She did not attend Zara and Mike Tindall's wedding in 2011, choosing to stay home in New Zealand, and she was also not seen at Peter and Autumn Phillips' first wedding in 2008.
Peter and Harriet will marry in the Cotswolds on Saturday (Getty Images).
Her grandmother, Dr. Shirley Tonkin, said Daily Mail during Zara and Mike's wedding, that Felicity will not be present and will not even watch the ceremony on TV.
She said: "Zara never contacted her - no one contacted her.".
She added: "She's very happy living her life, so I don't think they'll be watching - they didn't even watch William and Kate's wedding.".
Felicity is the daughter of Heather Tonkin (pictured) and Captain Mark Phillips (Getty Images).
Like Zara, Felicity also loves horses and currently works as an equine veterinarian. She is married to polo player Tristan Wade.
As reported by The Telegraph , Captain Mark provided her with financial support in raising her daughter, but, according to available information, does not maintain contact with her.
This means Felicity is unlikely to attend the royal wedding on Saturday.
Wedding guest list
However, it's likely that Peter and Zara's other half-sister, Stephanie Phillips, will be on the guest list.
Stephanie is Captain Mark's daughter from his second marriage to Sandy Pflueger, to whom he was married from 1997 to 2012.
Stephanie Phillips is Zara and Peter's second half-sister (Getty Images).
Stephanie was the petal-thrower at Zara and Mike Tindall's wedding in 2011 and Peter and Autumn Phillips' wedding in 2008. She called Peter "the best big brother ever" on Instagram and grew up nearby at Aston Farm on the Gatcombe estate.
Other guests expected on Saturday include the Duke and Duchess of Edinburgh, and Princesses Beatrice and Eugenie are also believed to be invited.
However, Prince Harry, Andrew Mountbatten-Windsor and Sarah Ferguson were not invited, the publication exclusively reported HELLO! last month.