@JD124B There are two types of dependents, "Qualifying Children"(QC) and standard ("Qualifying Relative" in IRS parlance even though they don't have to actually be related). There is no income limit for a QC but there is an age limit, student status, a relationship test and residence test. See full rules above.
Your son cannot be your Qualifying Child because he did not live with you for more than half the year. He cannot be your Qualifying Relative because his income was over $4300.
