Would this count as a legacy?

Originally posted this on NYU forum but no one has responded so I guess I should post it here:

My brother just got into Gallatin at NYU and as a sophmore in high school my dream school is Stern at NYU.

Would him going to Gallatin help me at all getting into Stern? If so how much?

It will in no way help. You will have to rely on your own qualifications.