You should contact a local lawyer that handles guardianship who can assess the specifics facts and then inform you of the process and procedure to follow if she is going to take on the case. If money is a problem such that you can't afford a lawyer there should be some help through legal aid. Otherwise, use the avvo lawyer search to start pulling names of some lawyers and set up an initial consultation with them. Best of luck
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Remove this post so that your contact information is removed. This is a Probate question. You would go to Probate court and get a Guardianship. Hire a Probate Lawyer.
This does not establish an attorney/client relationship. Dallas, Denton, Collin and Tarrant County, Texas practice area. Principal office located in Lake Dallas, Texas.
As mentioned, it's not too difficult to get a guardian of the person assigned by the Probate Court. You'll have to figure out where your brother will live and who that guardian will be. You might try calling Rio Grande Legal Aid or St. Mary's University Center for Legal and Social Justice. I don't think it's likely that you'll get appointed guardian if you are in Plano and he is in San Antonio.
Hire a San Antonio probate lawyer to help you.
You might consider moving your brother closer to you.
This answer DOES NOT establish an attorney-client relationship. This answer is based on the limited information provided and is not intended to be conclusive advice. There are likely other factors that might influence or change the advice after a more lengthy consultation.