Not everyone has the power to make a valid will under Michigan law. To create a will you must be at least 18 years old and be of sound mind. For a person to have sufficient mental capacity to make a will they must meet the following criteria:
Understand that they are deciding how their property will be distributed when they die
Know the nature and extent of their property
Know who their closest relatives are
Understand that their signature shows their approval of the will’s terms