Sue the SOB.....
On what grounds?
On what grounds? I would think the doctor can ask what he wants and you don’t have to go there. Just wondering.
There are no grounds, legal or moral, to sue the doctor. Just find another doctor (which is what this family is doing). And warn other people about the doctor if you want, to make things uncomfortable for him and reduce his clientele. But ultimately he has a right to conduct his medical practice as he wishes, and to reject patients if he wishes. Likewise, patients have a right to reject him for his intrusive questions.