The only way you will really know is if you file your own tax return and the IRS rejects your tax return because you are also listed on another tax return. The reject code will give you this indication. If this happens you must mail your tax return if you believe no one else is allowed to claim you as a dependent and/or you are not filing with your spouse if applicable.
If you e-file and your return is accepted this means the IRS did NOT receive another tax return with your specific name, social security number (SSN) and date of birth.
Lastly, it seems that if the filing status is married filing separately, and your name is associated with the other spouse return, it's possible your return could reject. In this scenario, you must also file by mail.
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