Si estan bien yes they are :)
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Colombians mostly skip breakfast, but they have lunch around 1:00 p.m and dinner around 5:00 - 7:00 pm at least, because that's when the people usually like to get home and freshen up.
Answer: The answer is Son
Explanation: It is the masculine form of "they are" which when added to the sentence means "My brothers are very hardworking."