What is the ruling on exposing a woman's 'awrah (part of the body that must be covered) in front of a doctor in the presence of her brother and a nurse?

The questioner : I say: May Allah reward you, O Shaykh. If I went with my sister to the hospital, and there was a nurse with the doctor, and the same doctor wants to examine her 'awrah (part of the body that must be covered), is it permissible for me to sit there, or should I leave because of the presence of the woman during the examination?

The Shaykh : Are you the woman's brother?

The questioner : For a woman.

The Shaykh : Yes, I mean, her full brother.

The questioner: Yes.

The Shaykh : Yes, it is not permissible for you to stay there. But likewise, it is not permissible for the doctor if the woman is performing the examination. If the woman is a doctor and is able to examine your sister, for example, then you and the doctor should leave.

The questioner: Yes.

The Shaykh : As for if the presence of the doctor is feared to be necessary, then in that case you stay, but you do not look at the 'awrah (part of the body that must be covered).

The questioner: Allahu Akbar.

The Shaykh : Yes, exactly.

The questioner : And what about my wives?

The Shaykh : A fortiori.

The questioner : May Allah reward you.

The Shaykh: Go ahead.