A will should be reviewed periodically, especially when there are changes in family or financial situations. Yes, a person can make his or her own will. However, self-made wills can create problems. Many words have special meaning in the law. When these words are used by a layperson, the results may not be those intended.
Children have no vested interest in their parent's property.
However in North Carolina, a spouse cannot be disinherited under a will. A divorce after a will has been written does not revoke the will. The divorce does, however, revoke all provisions in the will in favor of the divorced spouse. None of the beneficiaries named in the will should be a witness to it. All gifts by will made to witnesses or their spouses are void unless there are two other witnesses.