The first one is correct.
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louiSTSo it's actually notAs shown.an anextra information, because it's fortheunderstanding.
louiSTMy brother, who lives in Sacramento, buys very fresh strawberries.This means that you only have one brother. So it's just an extra information.
louiSTMy brother who lives in Sacramento buys very fresh strawberries.This means you have more than just one, like: The one who lives in Sacramento buys ve