If your brothers have had genetic testing, and their genetic mutation is known, then you can be easily tested. Harvard Genetics does the test at a cost of about $250 for a known gene. See their website at http://pcpgm.partners.org/lmm/tests/hearing-loss/OtoChip. You don't need to travel to Boston but, instead, can send a blood sample, and you will have the results in about 4 weeks.
If you don't know what specific genetic mutation your brothers have, then Harvard can still do the testing. However, it is much more expensive for an unknown mutation, and insurance likely would not cover it for you. However, insurance might for your brothers, and then you could be tested for the known mutation.