More embarrassing for an older brother or sister?

Which do you think was more embarrassing, an older brother watching a younger sister or an older sister watching a younger brother take the examination?

In my case I had a sister two years older and so there wasn't much difference, however I still felt ashamed, and that's why I always tried to turn my back on her and not let her see me being examined.

@maria_fetish I suspect the worst case would be an older brother watching a younger sister. Boys are used, to some extent, to be asked to disrobe in front of older females, the converse is rarer.

I was an only child, so I'll never know.

I was examined with my younger sister until I was 16 and she was 12. We both stripped down to our underwear at the beginning of the exam. The exam ended with our underwear off. We both witnessed each other being examined. The view at the time was that it was no big deal, it's just what happens at the doctor's office. I remember being confused by this because I felt very strong feelings of both embarrassment and arousal. I feel that we were both embarrassed to be examined in front of the other and aroused to witness the other being examined.

I think opposite gender would be more embarrassing. It would be fine if I was examined in front of an opposite gender sibling but she was also examined in front of me. What would be embarrassing is when you are examined naked in front of opposite gender sibling but then she is examined alone and you have to leave the room and wait in the waiting room. That would be unfair.

I was the older brother by two years so my younger brother always was examined first, and then he and my mom would leave and I was examined. So probably more embarrassing for him as I was usually examined alone or just with mom. Brother was always sent to the waiting room to wait.