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When an amendment to a will is drafted, it is called a "Codicil" and must be completed with the same formalities as the original will in order to be legally effective.
With that said, any amendment/Codicil must be dated and signed by the testator and two witnesses in order to be legally valid.
If the amendment/Codicil did not have two witnesses sign in addition to the testator, then it is invalid as a matter of law.
Any "interested party" (i.e. family member, beneficiary, etc.) can file a formal written objection with the court claiming that the addendum is invalid and a judge will then look at it and should throw it out as void.