Anyone else struggling w political discord and its impact on extended family relationships?

I have anxiety about the prospect of a Trump presidency...I honestly stay up worrying at night. My MIL had been liberal her entire life (Jewish, from NYC as a background) but now her long term boyfriend of 7 years has strongly influenced her. Her only source of news is now Fox News (shudder). She just seems to go along with his opinions. I'm worried if the trifecta of horrible happens - 1- Trump wins 2- he wins Florida (where they live) and 3- they vote for Trump, it may forever change my relationship with them, especially the boyfriend. Advice?