fee-simple, fee-tail, for life, for years, or at will. 2 Bl. Comm. 179. Persons who own lands by a joint title created expressly by one and the same deed or will. 4 Kent, Comm. 357. Joint tenants have one and the same interest, accruing by one and the same conveyance, commencing at one and the same time, and held by one and the same undivided possession. 2 Bl. Comm. 180.