look let’s cut straight to the chase because this conversation is becoming circular and you are practicing wishful thinking: at Columbia, your stepparent’s income is a factor in the financial aid process because they are part of your parents household. If they are both working, there is an expectation that they are sharing expenses, which as @BelknapPoint stated, frees up some money that your biological parent can use toward your education.
Yes, I know this first had as I have sent students to Columbia, I have been to a number of their admissions and financial aid events over the past decade (I looked into their process when my own kid was applying to college and last month I went to the NYSACAC, where Columbia did a number of presentations on HEOP and regular financial aid they said unequivocally that stepparents income/assets are part of their formula.
Both of your parents have to fill out their FA applications based up on the make-up of their households.
You really need to have a conversation with both set of parents to find out realistically how much they can afford to pay/borrow for you to attend Columbia