Where the evidence of such a witness is otherwise credible and sufficiently of probative value to the charge, the fact of his relationship to the victim or that he has other personal interest of his own to serve is by itself not sufficient to reject his evidence. In law, causes are not lost on the basis that the witness/s is/are members of the same family, association or community. Even where the Court fails or omits to caution or warn itself on evidence that is true in fact and sufficient to ground a charge, the failure or omission would not weaken the validity of such evidence or be fatal to a conviction.
– M.L. Garba JCA. Odogwu v. Vivian (2009) – CA/PH/345/05