You cannot pick children any how. Since Sarah and Emmanuel are not biological children of the plaintiff and her late husband evidence of adoption was material. Proof of adoption is essential both for the adopter and the adopted person or any other person for the purpose of devolution of property on the intestacy. From the pleadings, the burden of proof rested on the plaintiff/respondent who substantially asserted the affirmative of adoption of Sarah and Emmanuel. This forms an essential fact of the case of the plaintiff and if she could tender a certified true copy of the marriage certificate between her and the deceased husband, it was strange that she was unable to tender any documentary evidence establishing the adoption or offering any acceptable evidence to that effect. The burden of proof lies on him who affirms a fact, not on him who denies it.
– Remilekun Olaiya v. Mrs. Cornelia T. Olaiya & Ors. (2002) – SC.190/1999