Which of the following is necessary for a property transfer to be valid concerning the grantor's capability?

For a property transfer to be valid, the grantor must possess legal age and mental capacity. This requirement ensures that the individual initiating the transfer has the legal authority to do so and understands the implications of the transaction. Legal age typically refers to the age at which an individual can enter into binding contracts, which in most jurisdictions is 18 years or older.

Mental capacity is equally crucial; it means that the grantor must have the cognitive ability to comprehend the nature and consequences of the property transfer. If a person is deemed mentally incapacitated due to reasons such as mental illness or cognitive impairment, they may not be able to make a valid conveyance.

While existing in a trust, being married, or owning additional property may affect certain aspects of property ownership or the type of transfer, they are not essential criteria for a grantor's capability. These factors may influence the process or legal requirements surrounding the transfer, but they do not establish the fundamental capacity required for an individual to validly transfer property.