The Queen has already made the Duchess of Cambridge an integral part of her Diamond Jubilee celebrations.
And now she is also planning to include her parents.
Michael and Carole Middleton will be guests aboard the Elizabethan – a paddle steamer that will form part of the Thames boating pageant.
Kate's siblings, Pippa and James, may also be present.
"Michael and Carole's inclusion on the 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," an insider told the Daily Mail.
"Boats travelling in the Royal Squadron are solely reserved for special guests of the Queen, which demonstrates just how far the Middletons have come."
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