is there an easy way to hack someones yahoo account?

hi.. so i know this sounds sketchy but hear me out.

i am a single mom who has been recently been thinking about telling the father he has a kid.

when i first found out i was pregnant i told him he was the father and suddenly he was the most controlling person i knew and he said he wanted his girlfriend to be apart of the entire process with our child. all in all this made me feel uncomfortable so i told him he wasn't the father and as soon as he heard that he just said ok and called it quits.

let me cut to the chase. i don't know much about this guy (please don't judge me for my past mistakes) and i wanted to try to and see if i could try really finding out who he is through this. i do know his yahoo email but not the password

(let me just say that this man has called me a slut, psycho path, whore, skank and many many other things. the only reason why im debating telling him hes the is because i need my son to have a father one day. all i know about him is that he gets quite a lot of money because he owns his own business, he spends all his money on cars and boats and he is a little bit of a man whore because he does his fair share of slleping around)

PLEASE HELP ME! I NEED TO HACK IT TO TRY TO FIND OUT WHO HE IS!