The Appellants have argued in their brief that the burden of proof rested on the Respondents who are the persons propounding the Will before it would shift to them. This is correct as it accords with the position of the law. The apex court in Okelola v. Boyle (1998) 2 N.W.L.R. (pt.539) 533 at 547-549 per Ogundare, JSC (as he then was) quoted with approval the decision in Johnson & Anor v. Maja & Ors (1951) 13 WACA 290 at 292 as follows: “Where there is a dispute as to a Will, those who propound it must clearly show by evidence that prima facie, all is in order: that is to say, that the testator had the necessary mental capacity, and was a free agent. Once they have satisfied the court, prima facie, it seems to me that the burden is then cast upon those who attack the Will, and that they are required to substantiate by evidence the allegation they have made as to lack of capacity, undue influence and so forth”.
— J.I. Okoro, JCA. Mudasiru & Ors. v Abdullahi & Ors. (2011) – CA/L/58/2010