Key facts: Iowa requires standing as an interested party to contest a will; grounds include lack of testamentary capacity, undue influence, fraud, duress, and improper execution; the $50,000 estate value threshold determines applicable probate procedures; a 30-day waiting period applies after will admission to probate; the contestant bears the burden of proof by preponderance of the evidence; Iowa Code and Iowa Rules of Probate govern all procedural requirements; mediation may be required before trial; unsuccessful contestants may be liable for estate attorneys' fees.