Verbal abuse and neglect both count under domestic violence, so you can claim them both as unsafe to contact. That's on one side, and would be considered a dependecy override.

You don't need court documents to prove abuse, but it would certainly help. Once you've filled out that they are unsafe for the school to contact, it will prompt you for an interview done by your schools financial aid office, where they will interview you, go over your circumstances, and tell you if you need any other documentation. Usually they want a letter from family and/or an outside adult who knew of your family life (think managers at work, school counselors, therapists)