I take it you mean, "and that family member doesn't want the employee to have access."
I don't know of anyway to do it, but even if you could, it is unlikely that the employee will not get information even if it is overheard.
Personally, I would tell the family member that my staff has a right to patient data on a "need to know" basis, and it is very likely the family member's health information would at times be seen by the employee.
Based on this, the family member would be better served going to a different doctor.
