Mia has written a deed that says, "to chelsea for life, and upon her death the property shall go back to me." what kind of interest does mia have in the property upon chelsea's death?

she is the one in control of a living trust, once the other party has expired, the property would return to original owner. In the time that the property is in said 'possession' of other person, clarification would be needed as to which party would be responsible for control, ie if real estate, who pays the taxes?