<prompt> Human: My niece lived with us for a little over 8 months last year. My in-laws accidentally claimed her on their taxes. Apparently they forgot to tell the tax guy she didnt live with them anymore. They already filed and got their refund. I mailed in mine, and so far I received my state return check minus the dependent. I fear the federal will be the same. That puts me at a loss of about 4,400In-laws said we can just claim her for 2018 and well call it even. Thats a big no for me. I dont want to make a fraudulent dependent claim, plus neither of us have custody or guardianship for her for 2018 so I would have no paperwork, no proof, no evidence. I do have paperwork to show we had guardianship of her for 2017. Im not sure how to proceed - I dont want either of us to be in the IRS spotlight, but Its a lot of money for me to just shrug off. How do I take care of this without causing a rift?  <response>: Tell your in laws that they need to file an amendment 