Parents living abroad; guardian in US

No advantage, I am just confused. I understand now if the parents information is used then the student will be considered out of state applicant for every college even for NY colleges where he resides with me. Now, I have another concern. he is my dependent in my tax return, will that affect somehow in this college application process? What I am trying to achieve is to get the most possible financial aid for him. I guess this is a question for my tax preparer. If you can enlighten me though. I would appreciate. thx for the time you take to respond.