Is it normal for a guy to wear just his underwear around the house even when his sister is present?

Anonymous
I don't have any siblings so I never experienced any of this, but the guy I'm talking to lives with his brother and they walk around in their underwear which I suppose is normal because they are both guys after all however they also walk around in their underwear when their sister is over, is that normal or is that weird? I'm just curious.
Is it normal for a guy to wear just his underwear around the house even when his sister is present?
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