Dad cut contact with Monica because she isn't related and had no rights, plus he hated her because she took his wife in when she left him.
He knew he'd go running back there when he died because they have known each other since he was born.
It's also why Monica is never once mentioned as given any money because if she was related to the MC and had been with the dad she would be entitled to some and could contest it. That's also one of the big plot holes in the mod. If she was MC's mother she would have had rights.
There is also no hesitation without the mod because they aren't related, that was part of the rewrite for the mod.
If she was MC's mother the will conditions could not exist. They need to be reasonable demands by law and stopping him seeing his mother isn't and could be contested in court.
Simply put, the incest mod makes no sense. It's fine for those of you that use it but the dev never intended this to be incest, he's even said as much.
Well, True. Especially since MC was now an Adult. The Father Really Had No grounds or control.
Except for the fact that He had a Greedy, Controlling, Selfish, spiteful Bastard!
And whether you say Monica (as family friend) 'turned' MC's Mom against the Dad, and/or rejected the Father's advances;
Or (as MC's Mom), Monica left & Divorced Dad for being a Cheating Bastard;
Monica wounded the Father's precious Ego and pissed him off!
I Have played the incest Mod,.....I prefer the Original version better. It makes MORE Sense.
(I'm a Fan of a Good Incest story, But It need to be 'Built' that way. (ie "My New Family");
Not just change some relationship and dialog to Fit the Needs of the Mod & the perv's.