what do i do

How about you try to less of an idiot for a second? The uncle is already paying this kid below minumum wage, so hes got to be paying under the table. If his uncle wants to continue paying under the table, hiring an illegal immigrant would be acceptable. Any US citizen could easily get a job paying ATLEAST minumum wage. This is perfectly normal these days, infact my brother works at a company with which most of the people are illegal immigrants. Learn past the stereotypes.