Among those expected to attend Peter Phillips’s wedding this weekend is the groom’s lesser-known half-sister, Stephanie Phillips, who is believed to share a particularly warm relationship with Peter.The 28-year-old, who married William Hosier in 2022, is the daughter of Princess Anne’s former husband, Captain Mark Phillips, and his second wife, American equestrian Sandy Pflueger, who were married from 1997 until 2012.Mrs Hosier, who works as an eventing professional based in Worcester, has previously expressed her affection for her half-brother on social media, calling him “the best big brother out there.”She grew up on Aston Farm at the Gatcombe Park estate, close to her half-siblings, and is also thought to enjoy a close bond with Zara Tindall.Zara Tindall’s rarely-seen sister is being tipped to attend Peter Phillips’s royal wedding in just days | GETTYThe keen horsewoman has largely stayed out of the spotlight, with her last public appearance alongside her siblings being her own 2022 wedding in Tetbury.Mr Phillips is set to marry his NHS nurse fiancée, Harriet Sperling, this Saturday at All Saints’ Church in Kemble, Gloucestershire, with intense speculation swirling around which members of the Royal Family will attend.The ceremony, described by those close to the couple as an intimate affair surrounded by close friends and immediate family, takes place in the Cotswolds – an area where both grew up and which holds special significance for them.While the guest list remains a subject of considerable interest, attention has focused on notable absences and potential returns to public life among the extended royal clan.Zara, her half-sister Stephanie, and their father, Captain Mark Phillips, pictured in 2007 | PAThe wedding comes at a time when the Royal Family could use positive news, with one source telling the Mail that “nothing unites like a big church wedding.”Prince Harry will not be among the guests, with sources confirming that the cousins have “lost touch” over recent years.A friend close to Princess Anne’s son told the publication: “Peter and Harry haven’t spoken for several years and have simply lost touch, so he hasn’t been invited.”The absence stands in stark contrast to the pair’s shared childhood memories, which Mr Phillips fondly recalled during a 2016 Good Morning Britain appearance.Stephanie Phillips pictured as a flower girl at Zara’s 2011 wedding | GETTYHe spoke of family holidays at Sandringham, Balmoral and Windsor, describing how “there was quite a gang of us growing up” alongside the Waleses, Freddie and Ella Windsor, and the Gloucesters.”We caused quite a bit of mayhem and chaos, but fortunately, I don’t think we broke too much!” Mr Phillips said of those carefree days.Princesses Beatrice and Eugenie are expected to join senior royals at the ceremony, marking their first significant public appearance in months.The sisters, daughters of Andrew Mountbatten-Windsor and Sarah Ferguson, have maintained a notably reduced public presence following renewed attention on their parents’ connections to convicted sex offender Jeffrey Epstein earlier this year.Stephanie Phillips pictured on her personal Instagram | INSTAGRAM/@STEPHH_PHILLIPSSEugenie, who is currently in her second trimester, expecting her third child, hopes to be well enough to attend alongside her sister.A source told the outlet: “The Royal Family needs good news and nothing unites like a big church wedding.”Beatrice is going, and Eugenie is in the second trimester of her pregnancy but hopes to attend.”The insider added: “The King always wanted both to remain part of the family. He made it clear they are welcome at family events.”