Key facts: North Carolina requires contestants to have standing as interested parties; grounds include lack of testamentary capacity, undue influence, fraud, duress, or improper execution; estates exceeding $50,000 follow standard probate procedures; a 30-day waiting period applies after probate initiation; challenges must be filed in the county probate court where the will was admitted; contestants bear the burden of proof by preponderance of the evidence; and failure to timely act may result in the will becoming final and unchallengeable.