(a) Notwithstanding any other provision of this chapter, a person is not competent to act as personal representative in any of the following circumstances:

1. (1) The person is under the age of majority.
2. (2) The person is subject to a conservatorship of the estate or is otherwise incapable of executing, or is otherwise unfit to execute, the duties of the office.
3. (3) There are grounds for removal of the person from office under Section 8502.
4. (4) The person is not a resident of the United States.
5. (5) The person is a surviving business partner of the decedent and an interested person objects to the appointment.