District of Columbia Code Division II. Judiciary and Judicial Procedure § 16-1101. Parties defendant; joint tenants and tenants in common.

(a) A civil action based upon a cause of action in ejectment, may be brought against:

When a lessee is made a defendant at the suit of a party claiming against the title of the lessee's landlord, the landlord may appear and be made a party defendant in the place of his lessee.

Any person claiming to be in possession may, on motion, be admitted to defend the action.

(b) Joint tenants shall sue jointly in ejectment, but tenants in common may sue either jointly or separately, and any number of tenants in common, less than the whole number entitled, may sue jointly in reference to their undivided interests.