<prompt> Human: When my parents divorced in 2006, they were supposed to switch off every year with claiming me and my brother on their tax returns. One year my dad filed for the two of us, and my mom claims she was supposed to file instead.I know that if two people file for the same social security numbers, then they will be audited to prove that they supplied more than half the childs income. In this case, my dad had supplied all of it.And of course my mom got audited and couldnt prove that she provided for us, so this where her story starts to be unbelieveable.She claims that she didnt respond to the audit, and since this has happened, she hasnt filed for taxes. Now this happened somewhere in like 2008 or 2009. My question is, is this even possible?? What are the consequences of this?Edit: More clarification.My mom works at a hospital as a cardiovascular technician. She tells me that she makes 23 an hour and generally year round works more than 50 hours a week. She also said that her W2 from this last year says she made 70k.  <response>: Completely possible not to file for that long. 