Commandant Hux is visiting the Finalizer post-Starkiller. In the course of his stay, he realizes the stiff-upper-lip, restrained-but-deep-emotion father/son relationship he always assumed between himself and Hux Jr is actually... non-existent. General Hux is treating him exactly with the courtesy accorded to any visiting First Order officer of his rank, with no trace of familiarity or warmth beyond that.

Commandant Hux is devastated. Treating his son as a subordinate officer may have turned out a stellar general, but it was pretty shitty parenting. He's got to make up for lost time and reconnect with Junior!