Wills and Estates

If someone makes a will and later become metally unsound, is the will still valid?
Party A makes a will in sound mind and body. Several years later, Party A becomes mentally incompetent. Is this will still valid?
How do you obtain a copy of a will in which you inherited something?
Party B has been out of the country and was unable to be present for the reading of Party A's will or attend the probate proceedings. Party B is back in the country and would like a copy of Party A's will. How can Party B obtain a copy of the will?
Is someone is appointed executor of a will, are you required to accept the role?
Parent 1 has died and names a family friend as the executor. The family friend does not want to get involved with family matters in fear that it may affect their relationship. Does the family friend have to accept the role of executor?
What is an executor of an estate responsible for?
Party A dies of a heart attack. Party B is named as the executor. Party B does not know what it means to be the executor and is not sure what needs to be done. What is Party B responsible for as the executor?
What can one do with property such as furniture that was inherited from a deceased relative?
Party A was left some antique furniture in Relative A's will. Party A does not want the antique furniture and believes that it would be difficult to give it away or sell it. What are Party A's options?