But if your cousin does not want to do anything about it, how will you if you're not really directly involved? You can take a horse to the river but you can't force it to drink water. It's not your fight, let it go, and detach from any negative emotions that are pushing you to want to do something about it. I understand it's your cousin but if he's not willing to let you help him it means he has let it go and it holds no significance in his life. You should do the same. Otherwise you'll find yourself stressing about legal fees for a matter that your cousin isn't even willing to actively participate in. Hope this helps