Legal Question in Wills and Trusts in Maryland

First, if your mother is a resident of PA, you should consult a PA attorney. That being said, in Maryland, the powers conferred under a power of attorney are too personal to be delegated to someone else. Your mother, if competent, would have to execute a new power of attorney to add your wife and son. If she is not competent, your wife and/or son would have to apply to the court for a guardianship.