James, Earl of Wessex, is expected to be present as well. But his sister, Lady Louise, is highly likely to give it a miss as she is back in Scotland for university. Princess Beatrice and Princess Eugenie are also expected to attend the festivities, although their participation has not been officially confirmed. Similarly, Anne's kids, Zara Tindall and Peter Phillips, and their spouses may also be present. Although it's a big if, given Mike Tindall has only been part of it just once during the Queen's 90th. As for Peter, he's been a frequent sight in earlier years, even joining with his ex-wife Autumn and their daughters. But considering the scaling back of non-working royals and his very recent wedding to Harriet Sperling, the chances are rather slim.