User blog comment:TheBlueRogue/Bioshock Infinite DLC: Clash in the Clouds released, Burial at Sea announced/@comment-27.252.130.71-20130731115018/@comment-83.208.54.147-20130803014545

There arent any "actual father" Bookers. The one(s) she drowned is(are) as much her father as the rest, you were just playing as one. So this Booker apparently is from a reality in which Columbia never existed, might even be one of those Bookers who didnt even go to get a baptism (therefore he didnt get drowned).