Keep in mind that Questbridge is a vetting process that matches students with colleges. It will be the college that will be giving the financial aid. You will have to submit whatever the college requires you to submit in order to get aid from that school.
Quest bridge is very straight forward about whose financial information they need.
Look at the financial aid pages as most will require the CSS profile and the non-custodial profile or their own financial aid forms that ask for information from both sets of parents.