I need to get into my old Facebook. Explanation in the details.?

[Foolishjeans342]

I made my new Facebook and email around 2 years ago because I the old email I used for my Facebook was childish and I didn't want it anymore and didnt think I could change it so I just made a whole new Facebook and email. I never deactivated the account just stopped getting on it. Now, there is stuff going on with my dad and I and its kinda bad. I have old messages on the Facebook I stopped using of conversations with my dad that he's trying to deny we ever had and everything that was said in them. I need them for proof. I don't remember any passwords but I have a feeling they were very long. I got my email. I know there's a way around everything and I wanna know if anyone knows a way I can get in there.