For the pirate’s life book, if Jack Sparrow is indeed the father to our character I think for dead man’s chest there should be emotional moment between those two and instead of Elizabeth cuffing and leaving him behind, Jack decide to stay behind so Y/N can escape because he’s probably still protective towards him. Also I think our character will find out with the help of Jack’s compass because if I know correctly the compass directs the owner to whatever he or she most desires, so it will point where his father is. Although this is just a theory so I could be wrong.