For FA purposes who you live with more than 50% is your custodial parent and that is very clear. Don’t worry about court documents for this. You do need your dad to fill out FAFSA.
What you need to find out from each school is are they FAFSA only or do they want CSS or other forms. If the latter you need to check on their waiver procedure. Sometimes they will accept a form from your school or your religious institution attesting that the other parent has no contact with you/school/etc.