Unfortunately, a power of attorney does not have to be filed with the court or the clerk and so is typically not a public record--not unless there has already been some litigation or legal action involving it, in which case it may be part of the documents for that case. You can try asking your grandfather's lawyer or accountant, if you know who they are: they may have copies of the document, if it exists.If your grandfather is no longer mentally compentent (provably not mentally competent, by medical [i.e. doctor] testimony) and there there is no one coming forward with a POA to make decisions, etc. for him, his family can bring a legal action in chancery court (chancery court is a part or division of county court) for an order declaring him incompetent and appointing a legal guardian or conservator (both terms are used) to act and make decisions for him, and look after his welfare. Such a guardian would likely be a family member. If you wish to consider this option, consult with an elder law attorney about it.