Thanks for your question.
As executor of the estate it's your choice as to whether the information is revealed or not. If some beneficiaries are minded to remain confidential for the moment then I can see no value in revealing the details to the other at this stage.
In the end though, the Will shall become a public document once the grant of probate has been obtained, which anyone can order so you might advise those beneficiaries concerned with this to see if they alter their position. They will in the end be able to find out anyway but if some beneficiaries value their interim anonymity in any event then it seems fair to take this in to account.
You're just going to have to be diplomatic about it, make them aware of your somewhat awkward position and hope the modify their respective approaches accordingly.
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