My uncle wrote his will in the past. If he writes another will today, will the new will be the legal will?

Any will can be amended or replaced with a new will. If a new will is written and properly witnesses according to state law, the old will should be destroyed. This will ensure there is no mistake about the intention of the new will. If the old will is amended, the amendment should be kept with the old will. You might want to consult a probate attorney for help with this process.

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Your uncle can create a new will. Whether it will be valid or not depends on what is written, the condition of your uncle, whether its executed correctly, and many other factors. I would suggest having a lawyer create a will for him to make sure these issues will be dealt with correctly.

Yes, provided that he complies with the requirements of a valid will.

Not a problem. You uncle can write a new will. The new will document will state in part that any previous wills and/or codiclils will be void. After the will has been completed by state law, witnessed and notarized, the old will can then be destroyed. Be sure to get his directives done at the same time, living will, designation of a health care currogate, preneed guardian and perhaps a durable power of attorney in the event he needs someone to handle his finances due to physical infirmament. You should get an attonrey to do this for you.