Opinions?

So I own a home that's in my name, i pay half, my sons father pays half. 

 I have a son who his father claims on his taxes cause he pays his insurance. I would pay his insurance or put him on my plan but his father has it cheaper. 

My sons father claims our son on his taxes and keeps all the money he gets from him.... And he says it's fair cause I get money back from owning a home(I don't even know what I'll get back for owning a home since it will be the first year of living there but he gets about $1500 for our son) he has bought things for our house with the money he got last year but not $1500 worth. 

Is this fair? We're not married and never will be for other reasons. I feel like we should switch every year. Opinions?  I don't want to sound bitchy but also don't want to be getting screwed over lol so just want to hear what you ladies think :)