Is it normal for siblings to see each other naked?

Anonymous
I have two sisters. One is 3 years older than me and one 5 years younger. I am a fairly modest guy. But my older sister gives no shit about modesty when we both are alone. It became a common thing for her, as soon as our parents leave for some party or function, she goes around topless. If I nag her, her only comeback is " This is the only time I can do this. And why do you care?" cue in swinging boobs. We are very close. We practically share a room (only a wooden partition with a door separate are room).
On the other hand my younger sister is modest. Always primed up. But I have caught her peeking around when I am changing clothes and write it of as "curiosity".

But this got me thinking if is it normal thing in siblings.
Is it normal for siblings to see each other naked?
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