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If you are a US person then you will report the sell of the gifted property on your US return and you will be taxed in Switzerland on the sell.
You can use the form 1116 to claim a credit for the taxes you pay in Switzerland when you file your US return. This protects you from being taxed twice.
You will pay tax in the US on any gain. Gain is the difference in BASIS plus improvements and the sale amount less costs to sell. Your BASIS is the same as your mother's because this was a gift and there is no stepping up to fair market value for a gift unfortunately.
Because this house was given to you and your brother you report half and he reports half of the BASIS and the sale price.
Please let me know if you need clarification. If you do not then a positive rating is appreciated so I get credit for the response. (look for the STARS or SMILEY FACES)