The majority of Philip’s estate is likely to go to his wife, Queen Elizabeth II.
But the source claimed the Duke has also rewarded his closest aides.
They told The Sun: “Unlike some other royals, Prince Philip will be generous to the three men who looked after him.
Mr Bakewell frequently stood in for Philip when he could not attend engagements in his final years.
Mr Henderson is said to have been with the Duke during his last two days at Windsor Castle.
Prince Harry has been criticised for recent public comments on his experience of being a senior royal.
The source said: “Philip was not the sort of character to punish a grandson [Harry] for misbehaving.
“He was a very fair, even-handed and lovely man. Never held a grudge.”
A Buckingham Palace spokesperson told The Sun: “This is a personal matter for the family and as such arrangements are private.”
Source: EXPRESS CO UK