I don't think it's unreasonable to ask for family help in the face of serious health problems regardless of how old you are.

However for you right now the main issue is to reduce stress levels, and ruminating over real or perceived injustices is something I've found is very bad for my PCS.

I think you should take whatever course of action you think will allow you to move on and stop worrying about this issue, regardless of who is right or wrong. Your brain needs calmness.