Ah, well, that’s different if your sister didn’t give your parents experience with the need-based aid process.
I checked your other threads and TBH I’m confused. You mention qualifying financially for Questbridge, yet you say the Duke NPC has you paying 40% of the COA. I can’t picture where you really stand in terms of qualifying for aid. Normally, someone who qualifies for QB would also qualify for need-based aid at UMichican, but then I don’t know why you’d have a 30K EFC at Duke, then… and also don’t know why you wouldn’t qualify for the Illinois Commitment that would make UIUC virtually free.
You really need to sort out where you stand as a financial aid applicant - can you or can you not afford your EFC at full-need-met schools? You really can’t decide about ED, or formulate your application strategy at all, without this info.
You really need some financial safeties. People have made good suggestions on your other threads. Miami of Ohio, ASU Barrett, UA Huntsville, U of Utah Honors College (you’d likely get merit, and you could establish residency in a year and drop the price significantly for the last three years), SD Mines, Iowa State, and the MSEP reciprocity schools: UNL, KU, and U of Akron which is especially known for its work in polymers.
As others have said, you need to get clear on your financial resources and run the NPC’s with accurate info from your parents, and determine whether full-need-met schools should be the goal, or whether low-sticker-price-minus-merit should be the strategy.