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“What happens if a will is written in a diary with the signature of the person who wrote it, but no witness signatures?”
Question: That will depend in large part on in what state the will is probated, and in what state the decedent passed away (if different). In some states, such as California, a holographic will (i.e. a will written in the decedent’s own hand) with no witnesses is admissible. Although, if someone contests the will, be prepared to have to bring in a hand-writing expert, at least.