I think the FAFSA subject has been well established in regards to whether or not there are laws stating parents have any legal or moral responsibility in the student payment matters.
I think what needs to be focused on is maltreatment as a child and whether or not the parents meet the legal criteria for having violated their child's civil rights, and whether or not there are civil damages for child maltreatment. These questions would need the advice of an attorney who practices in that field.
Let's put aside the fact that many people feel uncomfortable suing their folks. That is not the question here, nor is it of relevance to the topic.
Some of the questions / statements an attorney defending the parents would ask / use are: "Why didn't the petitioner bringing challenge notify the state child protection services?", "The petitioner was a minor and so the petitioner would have no way to know about gender problems", "Why didn't the petitioner tell school officials about maltreatment at home?", "Your honor, the extent of damage done cannot possibly be determined within reason or within the minimum legal burden", "Your honor, Gender Identity Disorder is a psychiatric problem, and therefore we ask that the petitioner be found unfit on psychiatric grounds", "The petitioner's lifestyle is an active choice", "what other steps did the petitioner take to obtain medical help that he/she is seeking civil relief for?", "Judge, the statute of limitations has run out"...the list goes on and on and on of dirty tactics used by civil defense attorneys.
Remember, the legal burden in civil court is "PREPONDERANCE OF EVIDENCE" not "beyond the shadow of a doubt".
I capitalized preponderance because that is the entire game in civil court. Preponderance is a MUCH lower standard.
I am not in any way trying to discourage you from bringing suit, just highlighting the things I have learned out of my own curiosity in life when it comes to our justice systems. I am not an attorney and do not play one on TV or elsewhere.
If I were YOU, I would start talking to your state legislators about changing your state's laws to make maltreatment, neglect, abuse, whether physical or psychological, a crime without statute of limitations retroactively and with more severe punishment for offenders whose victims suffer real physical injury and / or severe psychological injury. That is what I am doing, and have been doing since years ago. I may be getting close since rewriting the bill several times, and am confident I can re-introduce it in the coming months.