What form of real property ownership ensures equal ownership shares with undivided possession rights?

The choice of joint tenancy is the most appropriate answer for the question regarding the form of real property ownership that ensures equal ownership shares along with undivided possession rights. In joint tenancy, two or more individuals own the property together, and they each have an equal share, which means that there is no division of the property's shares among the owners. Furthermore, they possess the entirety of the property together, which means no specific portion of the property can be exclusively attributed to any single owner.

Importantly, joint tenancy includes the right of survivorship, meaning that if one owner passes away, their share automatically transfers to the remaining joint tenants, rather than to the deceased's heirs. This feature distinguishes joint tenancy from other forms of ownership.

In contrast, while tenancy by the entirety also provides equal ownership and includes survivorship rights, it is specifically reserved for married couples. Tenancy in common allows for unequal ownership shares, where each owner can hold a different percentage of interest and does not necessarily include survivorship rights. Tenancy in severalty is a form of ownership where a single individual owns the property exclusively, without any shared interest with others. Therefore, joint tenancy best fits the criteria of equal shares and undivided rights to the entire property.