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Calling someone Sister or Brother does not mean you respect the person. Whatever you are not comfortable with should be discussed with your Fiance, that's one of the main essence of courtship. Why the sudden request by your Fiance? Have a discussion with him to sort things out. Remember that if you start calling them Bro and Sis, you have to continue till death do you part with your husband. On the other hand if this is what your Fiance regard as "submission" to him, you may have to start learing how to call Bro and Sis oooooooo.