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You owe nothing to this guy's daughter.
Neither do you owe this guy anything about her.
You DO owe it to yourself to see that this is a potential disaster and that the kid will destroy any chance at happiness for you.
GET OUT!! GET OUT!!
Also, be aware of the bleeding hearts who will attempt to guilt you into feeling something akin to their neurotic responsibility to cure the world's ills.
Being a psychonanny is NOT one of them.
This is the worst situation of your life so far.
If you allow yourself to be sucked into it any further, you will know misery like you never knew existed.
Get out and, good luck.