Colleges won’t care what your parents’ expenses are unless they’re medical bills. Even schools that will compare offers from peer schools have limits.
Northeastern calculated that your family can pay $65k/year and your parents’ limit is $15-20k. There is no amount of negotiation that will close a $45-50k gap.
Your dad is a doctor who owns part of his practice. I wouldn’t expect any need based aid from most schools, and I don’t think colleges negotiate merit aid at all. Did you apply to any schools that offer guaranteed merit?