While each state may have different requirements for creating a valid will, a valid will in Minnesota must be a written document signed by an individual who has attained at least 18 years of age and is of sound mind. In addition, the will must be signed before two witnesses and a notary public. Each person must separately create an individual will, as a joint will is not valid in the State of Minnesota. An experienced estate planning attorney can help you make certain that the requirements to make a valid will are strictly followed.