The last will cancels all preceding wills.
An addition to an existing will is known as a "codicil."
A man making a will is called a testator.
A woman making a will is called a testatrix.
LIMITATIONS OF WILLS
A man has a right to dispose of his property by will or gift as he chooses, but if he is married the law compels him to consider the rights of another.
The husband cannot, by will or otherwise, deprive his wife of her "right of dower" in his real estate and appurtenances.
Unless she chooses to accept, the wife need not accept other property that is bequeathed her in lieu of dower.
The wife's dower interest in her husband's estate is a life interest only. On her death it goes to the husband's heirs, as if there had been no widow.
In some states there is no right of dower.