Over here they're not even allowed to confirm that a person is even IN said hospital except to IMMEDIATE family members without the consent of the patient (or guardian) Not over the phone or in person. As the grandmother, even the Queen wouldn't qualify.
That said, I don't know how a caller would be verified to be a legitamate immediate family member.
Unintended consequences of the privacy aspect of the law is that hospitals are abandonning wards an semi-private rooms in favor of totally private patiant rooms. No other setting allows the doctor to discuss condition and treatment with the patient and still afford the privacy required by law.
Technically we're not supposed to give out any information to anyone without patient consent, depending upon circumstances we issue a password out which needs to be given over the phone, useful when family/loved ones live a long way off and cannot visit daily. All new hospitals are moving away from wards to rooms, great in theory but in terms of patient observation it can be a nightmare. The stupid part is, most patients, certainly who will be there a week or two like a ward where they can chat with other people rather than be stuck in a room watching Judge Judy or CSE New York all day.