Nobody is going to be celebrating any family connections in Season 5, since Mr. Kaplan spent her time in Season 4 completely uprooting Red’s entire empire, from his myriad personal connections to his financial wealth.
Through four years of The Blacklist, Red Reddington has done just about everything in his power to aid Liz Keen’s life, both professionally and personally (to an extent).
It was finally revealed in the finale that he did all that for the most part because he is definitely Liz’s biological father.
But according to creator Jon Bokenkamp, Red is cool with it.