Awake, he wouldn't disclaim his biological father, inasmuch as he didn't care for the old man. One couldn't choose one's parent's, merely make due and live with what you were given. He's slowly been dealing with the fact that his father likely did care for him more than he once realized.

However, asleep, the mind turns the desire for a more normal family, where one's father didn't constantly spend his time at work and who actually could express approval and care in a less complicated and more visible manner, preferably one without backhanded compliments.

Perhaps it was that desire which was the cause of him entering the house, and accepting the figure before him as a father figure, despite the fact they looked nothing alike. "It was good, how was yours?"