[T]he phrase 'who is or may be interested' in Rule 16-46 [of the Rules of Civil Procedure], requires that the interest or possible interest implicated by the Rule be one arising out of or be intrinsically connected to the estate and the devolution of the deceased's property. The interest must be a legal or financial one. The person claiming standing must have a stake in, and be affected by, the outcome of any challenge to the will.