Take Eve to court, and let your family know what happened to you in the same room as a jury.

Wow dude yeah don’t talk to them back honestly like they ruined your life just because of some delusional kid that made lies

Give them a chance once, if they try to blame literally anything about it on you, no contact

Tell them to f of and that you’re an adult now you don’t need them they didn’t even show up to your graduation and what years later they remember you and say sorry even your siblings just take time to heal and live YOUR life ignore them

If you want to heal, then start with texts to ask things you need an answer to like: how did it take 9 years for you to find out? And did you even look into it? If they shift blame or try to excuse it for any reason then you shouldn't give them the time of day. Your sister is a coin flip because while she started this, she was following what another person told her. Depending on her age at the time you could be more lenient or brutal about it. The cousin should be dead to you. Even if she dreamt it up it should not have taken 9 years to realize what she did and told the truth. She was more worried about what trouble she would get in rather than what damage she caused and how it effected others, like you