My ex told me he doesn't have my sons SS#'s and I pointed out it would be on his taxes since he gets to declare them. He says he doesn't have it and works in construction & gets pd cash frequently. I think he isn't claiming all his income or the exemptions. Can I report him to the court? Can I revise prior years taxes when he didn't take them as dependents and claim them myself? Can I have support revised based on his tax returns?