In most cases, none.
All individuals have a right to privacy. For this right to be violated there must be some overriding societal necessity or goal to be realized. Thus, a competent adult has a right, in most instances, to control the release of information about their health status to others, including their spouse and parents. This means that information about an adult child's health situation should not be shared with a spouse or parents (even if the child may be financially dependent), unless the adult child authorizes disclosure, or the individual requesting information has been appointed the legal guardian for an incompetent adult child. The only situations where consent would not be needed would be those limited exceptions to the physician-patient privilege, such as "the duty to warn" under certain conditions.
