Can you claim kids that are not yours on your tax return?

My fiance has kids from a previous relationship, and I claimed them on last years tax return and now i'm getting audited. They say i'm not allowed to claim them if they're not legally mine, but I am the only one bringing in a income while she is unemployed and watching the kids. For awahile now i have... show more My fiance has kids from a previous relationship, and I claimed them on last years tax return and now i'm getting audited. They say i'm not allowed to claim them if they're not legally mine, but I am the only one bringing in a income while she is unemployed and watching the kids. For awahile now i have been on pause with legal guardianship of them due to the mother going through court with the biological father. So is it alright to claim them, since they're living with me and I am supporting them as well as her. Any type of advice would help to get me out of this situation, I did get a big return and the IRS want it all back.
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