Determination of question as to legal representative

5. Determination of question as to legal representative.—Where a question arises as to whether any person is or is not the legal representative of a deceased plaintiff or a deceased defendant, such question shall be determined by the Court: [Provided that where such question arises before an Appellate Court, that Court may, before determining the question, direct any subordinate Court to try the question and to return the records together with evidence, if any, recorded at such trial, its findings and reasons therefor, and the Appellate Court may take the same into consideration in determining the question.]