If the guardianship is in Michigan, then the hearing or hearings to terminate will be in Michigan. This does not mean you need to move to Michigan, but you will have to be present in court. You really need an attorney to assist you with this, unless the current guardian(s) will go along with the termination.
Things are always easier to do when you are present. With that said, are you trying to terminate a limited guardianship? Are you looking to replace it with someone else? Are both parents on board?
As my colleagues have pointed out, this can only be done through probate court proceedings. An attorney would be helpful.
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I agree with my colleagues.
Do you have a better plan to replace the Guardianship?
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.