My father died, how do I going about finding the value of his estate?

The power of attorney stopped when your dad died.  The person who takes control of an estate is either the Admininstrator, if your dad didn't have a wil, or the Executor, if he did have a wll.  Many times the value of the estate, and assets in the estate, will be included in the application for probate.  You should start with the paperwork filed at the county probate office, of the county in which your dad lived at the time of his death.  Usually an estate should be resolved within 9 months to one year, so you are getting close to that time.  If you know about stocks, call the broker or company thta holds the stocks and determine if your dad had beneficiaries listed for the accounts.  Good luck.