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Tom left his entire estate to his wife in his will. Tom signed the will with his signature in the presence of his two fourteen-year-old grandchildren, Siya and Della. Tom asked them to sign the document. Not realising that they were witnessing a will, Siya signed with his initials and Della made an ‘X’ as a joke, in the presence of the testator.
This will is invalid for the following reason: