I wouldn't mind an extra $10,000 a month tax-free myself! Even though I have what some might consider a reasonable income, I wouldn't mind being able to fly 1st Class all the time.
Are these arrangements tax-free legally? That is, is the money considered taxable employment income or a non-taxable gift?
He was adopted from Romania, has grown up, and now lives in the US? That's a difficult situation. Not as bad as an aged-out foster child, perhaps, but still not good. Let us know what happens, please.