Can my Father In-Law claim my wife on his taxes?

My wife and I got married back in May of 2017. My wife has been attending college for the past 4 years and during that entire timr her parents have been paying for her college. In order for her dad to get a refund for on his taxes for paying for her college he must claim her. 1. Can he claim her even though... show more My wife and I got married back in May of 2017. My wife has been attending college for the past 4 years and during that entire timr her parents have been paying for her college. In order for her dad to get a refund for on his taxes for paying for her college he must claim her.

1. Can he claim her even though we're married and even though we have filed jointly. Currently, she is unemployed and my income is what we rely on as for now.

2. If he can claim her would that mean that I cannot claim her?
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