The Queen has reportedly invited the Middleton family to join the royal party at the Thames Diamond Jubilee Pageant.
The Duchess of Cambridge and her husband Prince William will accompany the Queen on the royal barge.
Kate's parents and siblings are reportedly to sail on the Elizabethan, a replica 1890s Mississippi paddle steamer.
The fact that the Middletons are being included in the royal party shows how cordial the relations are between the in-laws.
A source told the Daily Mail: "Michael and Carole's inclusion on Elizabethan has only just emerged and has taken a lot of people by surprise, but the Queen is incredibly supportive of the duchess and her family.
"Boats travelling in the Royal Squadron are solely reserved for special guests of the Queen, which demonstrates just how far the Middletons have come."
The event on June 3, will see a flotilla of 1,000 boats in the largest celebration on the Thames for 300 years.
The cavalcade will stretch for seven miles and will include several orchestras and choirs, making their way from Battersea to Tower Bridge.
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