My father in law is claiming my wife, who is 21 and who is a full time student, purely to get a refund from the college on his taxes. I was told that I could still file jointly with her but here's the problem. When I say that my wife is being claimed on someone else's tax return I am then told that I no longer qualify for Earned Income Credit and Child Tax Credit. I was also told that I couldn't even claim my 8 month old son! Before I said she would be claimed as a dependent on someone else's tax return I had $6,000. After I did this I now have $776. What's going on?