1. Where in halacha is it mentioned that when anyone else is listening to someone make kiddush or havdalah, l’chatchilah they must be either sitting or standing depending on what the person is doing?

  2. In addition, the Chazon Ish indicated that if a person did not do so he/ she is not yotzei even b’di’eved. Can you please tell me the source for this?

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