My sister and her husband, both of whom were full-bore Bernie-bots, has said they have no idea who they’re going to vote for come November. She’s leaning third-party, but by that she means Green Party or some other left-wingnut party. Don’t know if they’d just ‘stay home’, as Fat Nasty says.
Tell your sister and brother in law (liberals who are married — to the opposite sex?) to vote for the Green.