User blog comment:Mr Bio Shock/Attempting to Understand Infinite's Ending... (Spoilers, of course)/@comment-3048593-20130329212731/@comment-3503432-20130329224100

I know their relationship never goes beyond one of trust and friendship, although at some points I could've sworn there was some romance blossoming- if you turned your head and squinted. I guess one of the reasons why there was never any sort of romantic connection was because when the player realized they were father and daughter at the end... It would've been very awkward.

And who knows? There was no Columbia in the end and Booker returns to being just some guy.