Is it weird that my sister seems okay with me seeing her in her underwear?

I was helping her when she was trying on dresses and she just causally slipped one of them off without even thinking about it, I saw her in her underwear and she wasn't embarrassed or anything.

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JakeeB · M

Of course that's not weird. My sisters see each other undressed all the time. Even if I see my sister in her underwear, it's not like it's a big deal. Boys walk around with pants on and no shirt all the time. It's the same concept. You didn't see anything more than you would have if she was in a bikini or a normal swimsuit. And you saw less than complete strangers see in locker rooms.