When Hux was little, he was neglected by his mom, abused by his dad, and surrounded by adults who enforced the Imperial way on everything and treated him as little more than a cog, not caring about any want or need or personality he could have.
The constant propaganda against the enemies of order often featured Leia, Han and Luke as villains who did all the things that little Hux wished he could do but knew weren't allowed and he was supposed to hate. He coped with his life by fantasizing that the leaders of the rebel scum were his family.
Even after all the conditioning did its job and he actually hated the things they represented rather than want to do them too, he always kept a soft spot for them, although he found it shameful.
That's when he finds out what Ben Solo did and who he is.
Gen or Kylux, family jealousy, tw child abuse
The constant propaganda against the enemies of order often featured Leia, Han and Luke as villains who did all the things that little Hux wished he could do but knew weren't allowed and he was supposed to hate. He coped with his life by fantasizing that the leaders of the rebel scum were his family.
Even after all the conditioning did its job and he actually hated the things they represented rather than want to do them too, he always kept a soft spot for them, although he found it shameful.
That's when he finds out what Ben Solo did and who he is.