Your mom died about four years ago. I’m sorry for your loss.
But the fact is…your dad is now your custodial parent, and the income and assets of his wife, and him will be considered when need based aid is determined. Do they have a high income that would prevent you from getting need based aid?
Are you instate for Virginia…or Washington?
Cornell gives only need based aid…no merit. UVA has some highly competitive merit awards but mostly need based aid.
If your parent and stepparent aren’t contributing a dime…you need a full ride…
What is your SAT or ACT score. Any chance you will be a NM finalist?
Oh and don’t apply early decision…because you have significant financial constraints…and it will be VERY important for you to be able to compare multiple net costs and acceptances.