Power of attorney is given by the person when he or she is competent and of sound mind. He or she gives the power of attorney to someone (usually a spouse or child or both) so that these people can make life decisions for this person during incapacity. It is usually done when other testamentary documents are signed. If a person (step son) has power of attorney over his mother, only the mother can override that power of attorney. Further, in extreme cases, the husband could bring an action against stepson if there is an abuse going on or improper influence.