Usually the custodial parent for the Profile is the same as the custodial parent for the FAFSA.
Just an FYI to the OP. This rule about custodial parent being who you live with most will be changing for the 2023-2024 FAFSA form. The custodial parent will be the one who provides the most of your support (hard to make that someone who doesn’t work and hasn’t filed taxes….).