Key facts: Standing requires pecuniary interest in the estate; 30-day waiting period after probate filing; $50,000 estate value threshold for certain procedural pathways; Grounds include lack of testamentary capacity, undue influence, fraud, duress, and improper execution; Burden of proof is preponderance of the evidence; Costs are generally borne by contesting party unless brought in good faith; Estate assets distributed before contest resolution may require return if will invalidated.