DAGADU AND OTHERS v. ADDY AND ANOTHER Practice and procedure—Parties—Proper party to sue—Action for declaration of title to land—All parties in physical possession of land to be sued as defendants—Defendants in possession as tenants of another party—Whether plaintiffs' claim for declaration of title against defendants proper—Obligation on tenants to notify landlord of pendency of such action—Rationale—Law of Property Act, 1925 (15 & 16 Geo. 5, c. 20), s. 145—Courts Act 1971 (Act 372), s. 111—High Court (Civil Procedure) Rules, 1954 (L.N. 140A), Order 12, rr. 19-21.