Deductions & credits

That’s the thing. The insurance plan requires him to be listed as a dependent on the first page on the taxes. 
So if the IRS won’t allow him to be a dependent even though I support over half his living expenses just because he’s not going to school. The insurance plan won’t add him even though they say he doesn’t need to be in school but require the tax page that has him listed on it which can’t because he’s not in school. The amount he makes doesn’t matter if you say he’s in school so why does it matter if I say he’s not?  Just really stupid.