Get as many people as you can to vote for him or if they can’t, don’t vote Joe. My son refused to vote Trump because he didn’t like his attitude and his girlfriend wasn’t happy with Trump. So, I talked him into Jo Jorgensen. He looked at her stuff and liked what he saw. He’s centrist.
I too have been trying to convince people who just refuse to vote for President Trump to vote for third party, write in someone, or just stay home. There are definitely some former Republican voters (mostly women and some evangelicals) who just won’t vote for President Trump, but they don’t like Biden.
I also think there are a good number of people who wrote in a candidate in 2016 because they just didn’t trust that President Trump wasn’t going to govern from the left as soon as he got into office. Those people have changed their tune.
Schedule post-election therapy for the lad. At least make him watch Tucker Carlson for the next six months.