I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
While your attorney was entirely correct, and you did not owe any money to your brother for the early termination expenses that were brought about entirely by his breaching his contractual agreement with you, it was very generous for you to do that.
You again, certainly have no legal obligation to give him any more money, and the tax consequences he is facing almost certainly have to do with his apparent inappropriate attempt to somehow write off the vehicle payments on his taxes---again this is not your problem.
It is not always easy to convince a family member that you want them to leave you alone and not harass you, and legally, your options are pretty limited.
Typically what I suggest is that a person write a letter to the other person telling them to not make any further contact with you, to leave you alone and to stop harassing and stalking you.
If they continue after that, then you may call the police and file a complaint for harassment
Finally, failing all else, you may file a Complaint for protection from Harassment with the local court and they can issue a protective order for you and against your brother. Once that order is served on him by the sheriff, if he continues to harass you, you may notify the police and they will arrest him. This would be a very serious criminal violation for your brother to commit and the law will help you.
Here is a link to the form that you can file with the court seeking protection from Harassment:
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2015,