Dear Ms. Garcia:
What state are you in?
Why is this law firm trying to locate your husband's brother?
What you are describing violates the Fair Debt Collection Practices Act (FDCPA), which is available here: http://www.ftc.gov/bcp/edu/pubs/consumer/credit/cre27.pdf. The next time the law firm calls, tell them to stop contacting you. If the firm continues to do so, you can report them to the Federal Trade Commission (FTC). The contact information is in the FDCPA publication.
It may violate the Texas Debt Collection Practices Act as well. The Consumer Protection Division of the Texas Attorney general may be able to take a complaint for you. Here is their website: http://www.oag.state.tx.us/index.shtml.
Here is a website with more information on both the FDCPA and TDCPA: http://www.houstonconsumerlaw.com/en/art/?5.
In addition, some states have laws against unauthorized audio recording of conversations. I don't believe Texas is one of them, but if the law firm was calling from a state that prohibits such recording (California is one of them), they would be violating that state's law.
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