that would still go against patreon rulesI think he's gonna be the guy that lives with them, which the girls call dad, but not really their father... and he's gonna become a bigger character, maybe a reflection on the pussy hound version of the MC as he(Santiago) is trying to get some pussy on the side and maybe ruins his life with Adriana.
it makes more sense that he is just the old friend of their dad.
it was also hinted that he might be Gabi's husband. and that might create an issue with patreon rules too if MC is on her path.