An overwhelmed single-father, hesitantly adopts the 10-year-old daughter of a former love who is about to die, only to learn the young girl is actually his.

Or you could make the story about a commitment phobic single man who agrees to adopt an ex-lovers child. Complications arise when the child turns out to be his.

Story would be more a drama about his struggle to accept being a father.

As far I'm aware you tell acts 1 & 2 of the story. You wouldn't see the logline for Sixth Sense explaining he's already dead.

"Single father" definitely suggests he already has kids. Which detracts from the potential stress of adopting this kid, doesn't it?