Mo. Rev. Stat. § 524.090
Current with changes from the 2023 Legislative Session
If the action is brought by a joint tenant, or tenant in common, against his cotenant, the plaintiff shall also be required to show on the trial that the defendant actually ousted him, or did some act amounting to a total denial of his right as such cotenant.
§ 524.090, RSMo
RSMo 1939 § 1537