(a) The plaintiff may state in the complaint causes of action for the partition of all or any part of any properties in which the plaintiff and the defendants are co-tenants, irrespective of their location in the Commonwealth or of the proportion of the plaintiff’s interest in the several properties.(b) If the rights of all the parties are derived from a common source of title, causes of action may be joined even though one or more of the defendants are co-tenants of less than all the properties.