Probate; waiver of notice; proof of execution

§ 18–504. Probate; waiver of notice; proof of execution When the notice prescribed by sections 18–501 to 18–503 has been completed or if all parties interested adversely to the will have waived the notice and consent that the will be admitted to probate and record, the court shall proceed, if a caveat is not filed, to take the proofs, or to consider the proofs theretofore taken, of the execution of the will. All the witnesses to the will who are within the District of Columbia and competent to testify shall be produced and examined or the absence of any of them satisfactorily accounted for. A will may not be admitted to probate and record except upon formal proof of its proper execution.