This is for "Brucey". I believe that most brothers do go naked with each other, but not all. I had two older brothers and they did not go naked with me, for reasons that I didn't understand then, and still don't. I let them set the standard of behavior and kept my clothes on around them too, but I would have gladly sacrificed my own modesty for a chance to see them naked.
I did realize that other families were different, and that many of my friends reported seeing their own brothers naked often and regularly.
My father never went naked before us either, but on one occasion, when my brothers and I were taking turns in the bathroom changing clothes, our Dad berated us for being overly modest and laughed and said "His looks just like yours!"
I wanted to say to him "Then why don't you let us look at yours?", but I didn't.