Affidavit
The Affiant
Any person having the intellectual capacity to take an oath or make an affirmation and who has knowledge of the facts that are in dispute may make an affidavit. There is no age requirement for an affiant. As long as a person is old enough to understand the facts and the significance of the oath or affirmation he or she makes, the affidavit is valid. A criminal conviction does not make a person incapable of making an affidavit, but an adjudication of INCOMPETENCY does.
Someone familiar with the matters in question may make an affidavit on behalf of another, but that person's authority to do so must be clear. A guardian may make an affidavit for a minor or insane person incapable of doing so. An attorney may make an affidavit for a client if it is impossible for the client to do so. When necessary to the performance of duties, a PERSONAL REPRESENTATIVE, agent, or corporate officer or partner may execute an affidavit that indicates the capacity in which the affiant acts.
A court cannot force a person to make an affidavit, since, by definition, an affidavit is a voluntary statement.
Additional topics
Law Library - American Law and Legal InformationFree Legal Encyclopedia: Additional voluntary contribution (AVC) to AirspaceAffidavit - Distinctions, The Affiant, The Taker Of The Affidavit, Contents, Functions - Basis, The Oath or Affirmation