It is possible to draft Wills that are intended to be irrevocable. These are known as Mutual Wills.
Mutual Wills are where the parties agree to leave their estate to an agreed third party when they have both died.
This is very common when for example parties have children from previous marriages and wish to insure that their children cannot be cut out by the survivor altering their Will. The law surrounding mutual Wills is complex and it is vital that you obtain specialist legal advice if you are considering mutual Wills.
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