Section 700.3407 - Formal testacy proceedings; burdens in contested cases(1) All of the following apply in a contested case: (a) A petitioner who seeks to establish intestacy has the burden of establishing prima facie proof of death, venue, and heirship.(b) A proponent of a will has the burden of establishing prima facie proof of due execution in all cases and, if the proponent is also a petitioner, prima facie proof of death and venue.(c) A contestant of a will has the burden of establishing lack of testamentary intent or capacity, undue influence, fraud, duress, mistake, or revocation.(d) A party has the ultimate burden of persuasion as to a matter with respect to which the party has the initial burden of proof.(2) If a will is opposed by a petition for probate of a later will revoking the former, the court shall first determine whether the later will is entitled to probate. If a will is opposed by a petition for a declaration of intestacy, the court shall first determine whether the will is entitled to probate.1998, Act 386, Eff. 4/1/2000 .