The sentence which is grammatically correct is given below:
My brother and mother don't read the newspaper.
Grammatical errors may be characterized as the duty of rectifying distinguishable types of mistakes in text such as spelling, punctuation, grammatical, and word choice errors.
There are two options to this question:
So, the option My brother and mother don't read the newspaper is grammatically correct. This is because does or does not is used if the subject is third-person singular, but here there are two people.
Therefore, it is well described above.
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