What crack are you on? There is Decisions of Life, which has a staggered release on Patreon, but is the incest removed public version. Sophia becomes landlady etc etc. Some scenes are also removed.
Then there is A Wife and Mother, which is the proper version and the one uploaded here, incest included, no patch or special code required. Not that there is much in the way of actual incest in the game yet. The only mod you might need is to change relationship points.
Julius Kingsley - I think you may be confusing unable and enable, which have opposite meanings. But irrelevant, since you don't need to do either with A Wife and Mother.