You might want to tell the judge that you are not a party to the action and have no standing in the matter, if that is the case.
[In accordance with the Avvo community guidelines, this communication does not constitute "legal advice", nor does it form an attorney-client relationship.]
If you have filed an objection, you must have some sort of standing in the matter, or the judge would have dismissed the objection.
To answer your question though, if you intervene in a case, YES the Judge can order you to take specific actions to provide him with the evidence needed to decide the case, including most basically, getting witnesses to testify. If you don't know how to do this, you NEED to hire representation. I urge you to consult with a local Probate attorney in order to be sure this gets done correctly.
This answer is offered for informational purposes only and does not constitute legal advice or create an attorney/client relationship. I am licensed to practice in Michigan only. Please seek competent local legal help if you feel you need legal advice!