Which form of ownership does NOT provide equal rights of possession?

Tenancy at will is characterized by its flexibility and lack of a fixed term, meaning that either the landlord or tenant can terminate the arrangement at any time with proper notice. This form of ownership does not confer equal rights of possession among parties since it typically allows one party (the landlord) to maintain a level of control over the property without necessarily granting equal possession rights to the tenant.

In contrast, the other forms of ownership—tenancy in common, tenancy by the entirety, and joint tenancy—are defined by shared ownership rights among the co-owners. For instance, tenants in common possess undivided interests in the whole property and have equal right to use it, while joint tenants share equal possession and may have rights of survivorship. Tenancy by the entirety, often used by married couples, also provides equal possession and shared responsibility for the property. Therefore, tenancy at will stands out due to its more fluid nature and the disparity in rights of possession between the landlord and tenant.