> When they die, it becomes part of their estate and it's not confidential anymore.
IANAL, but I don't think the law works this way. If you reveal any of that confidential information, you would be as liable to getting sued for breach of confidentiality as your father was. I believe this will be one of those cases where ignorance of the law will not protect you, beause it is common knowledge that what happened between your dad and his clients is confidential information.
Given that statute affecting everyday life has grown to a scale that nobody, not even lawyers or even judges, can study and apply it consistently; it's hard to say how anyone could be expected to apply it. The great majority of laws on the books are not intuitive either.
Honestly I end up wondering how the legal system functions at all.
IANAL, but I don't think the law works this way. If you reveal any of that confidential information, you would be as liable to getting sued for breach of confidentiality as your father was. I believe this will be one of those cases where ignorance of the law will not protect you, beause it is common knowledge that what happened between your dad and his clients is confidential information.