Married couples should have two wills to ensure that each individual’s wishes are fulfilled.
For example, if you personally own a watch that you would like your son or daughter to inherit, that should be covered by your individual will. In some cases, one spouse may not want the other to inherit a property in which the couple lives but is owned by an individual.
A will is a personal thing but if both partners have identical wishes, a mirror will is an option. In a mirror will, the content of both wills is nearly identical, except for the name of the testator.