It is your duty to advise your younger sister if she is a minor to dress and it is your duty as adults to dress in her presence.
Now, if she is 18+ (or 21+), she is basically free to do whatever she wants as long as you are fine with it and both parties are fully consensual about it.
I personally would refrain from being nude in my own place in the presence of guests. Even though it is your property, you are subjecting your adult guests to potentially shocking exposure.
If you want to be nude in your property but have guests, it is again your duty to inform them prior to having them over and to give them the choice to accept or refuse to be at your place.
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You didn't say how much younger your sister is, that's an important piece of info., her age would change my answer.
If she's 15 years younger I'd answer different than if she's 5 years younger.
If you're a nudist whydo you care if she's clothed or not? I'm a nudist and in home anyone can choose to be nude if they want to be.
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