I think the question is much simpler - where does he STAY when he is in FL on business? If, when he comes ‘home’ to attend to constituent affairs, he is staying routinely in a hotel or a short term rental of some sort, and not at his MIL’s home where he claims residence and voter registration, then it is most clearly a fraud.
If he stays at her place when he is in town then it is a much smaller issue in my mind.
Simple question: when in FL for his home town trips where has he most commonly stayed in the past?
The funny part would be if he were forced to now stay with her more often than he has previously, and she gets sick of his smarmy self-righteous a$$ and kicks him out.
He’ll have to put in some appearances I would think or OReilly’s producer will pop out of the bushes.