Idudun v. Okumagba (1976) 9-10 S.C.277, (1976) 1 N. M. L. R. 200, as follows: (1) By traditional evidence; (2) By production of documents of title duly authenticated and executed! (3) By acts of ownership extending over a sufficient length of time numerous and positive enough to warrant the inference of true ownership; (4) By acts of long possession and enjoyment and (5) By proof of possession of connected or adjacent land in circumstances rendering it probable that the owner of such connected or adjacent land would, in addition, be the owner of the land in dispute. See also Mogaji and others v. Cadbury (Nigeria) Ltd. (1985) 2 NWLR (Pt.7) 393. Fasaro and Another v. Beyioku and others (1988) 2 NWLR (Pt.76) 263. Okonkwo v. Okolo (1988) 2 NWLR (Pt.79) 632. I think a party can use the above five ways to prove co-ownership by leading evidence to establish joint or common rights over the land.
TRADITIONAL EVIDENCE THAT LAND IS JOINTLY OWNED IS PROOF OF CO-OWNERSHIP
For example where there is convincing traditional evidence that the land is jointly owned or commonly owned by the parties, a case of co-ownership is proved. Similarly if the plaintiff tenders documents which are jointly authenticated or jointly executed by the co-owners, a case of co-ownership is proved. So also is evidence of joint possession. But, evidence of family genealogy, or traditional history, without more, cannot be held to be sufficient evidence of co-ownership.
— Tobi, JCA. Abraham v Olorunfunmi (1990) – CA/L/83/89