(1) "Interested person" means an owner by descent or succession, an alleged heir or devisee of a decedent, any other person claiming an ownership interest derived from an owner by descent or succession, or an alleged heir or devisee in any property the descent or succession of which is to be determined pursuant to this part 13, but excluding any person holding a nonownership interest in such property.
(2) "Owner by descent or succession" means a person in whom all or any part of the decedent's interest in the property vests as a result of intestate or testate succession.
(3) "Property" means the property interest owned by the decedent at the time of death without regard to other property interests which may be owned by other persons in the same parcel of real property or item of personal property.