by confidentiality agreements. Would HIPPA be involved here?

information, it only applies to medical care providers and other similar people. It doesn't apply to other patients directly, though, or to individuals who do not have a health care connection. If it did, then families and friends would be prohibited from disclosing such information. They are not prohibited from that.

but through theft?

What's the nature of this 'info?'

what he talked about in group sessions and AA type meetings

Those are supposed to remain confidential. This is a very sleazy thing to do, and will only cause more pain for his family.

is willing to buy it.