In 2015 (2014 taxes) my daughter was claimed on my mother in law's taxes (currently ex mother in law) I found out by my e-filing being rejected, but went through when I took my daughter off. I knew that she might file as she had permission in the past. After filing my taxes, I tried contacting my mother in law but she wouldn't respond for 2 months about that subject. She told me yes, she filed my daughter without permission and that it was an accident. She apologized and said she won't do it again.
I have recently learned you can ask questions like this on this site, so I wondered what I can do. 2014 has come and gone, refund issued to her for claiming a dependent she wasn't supposed to, and I received mine with no kids. So how will filing an amended return work if I am adding a dependent that was already claimed? I've read contradictory things such as they will use the highest AGI (which will not be mine) and that the parent always has first rights to claim their children.
What will happen if I try? How do I go about it?
