I do not know why you are not responding, but you are not charged per question, per response, nor per answer. So after I give you my answer, you can continue to ask me questions without additional charge until you are satisfied. I apologize if it is a site issue that you posted and the post did not go through.
You can apply for the B-2, but most likely they will not approve it. Why? Because to get one, you are supposed to have immigrant intent and when you have a pending I-130, that is evidence of immigrant intent. Luckily, you can try and if you fail, it will not have a negative impact on your mother's petition for you. If you get the B-2 approved and you attempt to enter the U.S., at that time you must prove a second time that you have the intent to go back home. As long as you do not lie about anything, it will not hurt your brother's petition if they do not let you in at that time, but there is a small risk of a 5 year bar if they do not allow you to withdraw your request to enter if they decide not to let you in.
So try to apply, but to not lie about anything.
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