I dare to say your lawyer is wrong.
All of us here are expressing opinions with only minimal information about the situation. How can we give informed answers without knowing the basics requested above (e.g. are the parents married, divorced, etc.)? It would be logical to assume that the lawyer knows more of these facts than we do (aside from knowing a bit more about the law).
The perverse part of this is the cost-shifting of whatever drama is going on in their lives (real or imagined) to your practice. I wonder if practices should have a disclosure form made up that stipulates that any issues about records and similar are now referred to your legal counsel, and they charge $XYZ per hour, along with your administration fee. The ante is $XYZ, and in the event of conflict, loser pays.
