The probate court shall at all times be considered as open, except on Saturdays, Sundays and holidays, with authority to do all things needful in relation to granting letters testamentary or of administration or guardianship and all matters pertaining thereto and making all other necessary orders which are grantable as a matter of course.
In all cases, any order or decree may be set aside or amended and the case reopened within 30 days after the rendition thereof by the judge of the court in which said decree was rendered or said order was made.
Ala. Code § 12-13-3 (1975)