A "child", living a home, can continue to be a qualifying child for EIC and the dependent deduction thru age 23, if he is a full time student (high school counts as being a student). He just doesn't qualify you for the Child Tax Credit.
An 18 year old (in high school or not) is still a qualifying child. It's doubtful that he provided more than half his own support with only $3569 of income, So you can claim him. You will get about $1060 with $3200 of earned income.
A child can be the “qualifying child” dependent of any close relative in the household. If you live with someone else, e.g. your parents, it may be better if they claim your child.
