My boyfriend and I have split up and while "we" set up a 529 plan soon after our son was born, my ex manages it because I've always been hopeless with money. But, in my attempt to grow up a bit I've decided that I do want to contribute to our son's future (be it education or exploration or whatever). I am not sure if I can set up my own 529 because I assume it's dependent on who is claiming our son because of the tax exemption?

So, what can I do. I'm a financial dunce. Help.