There have been numerous, very frustrating attempts in the past. Sometimes we'd try both boys. We always ran into the same roadblock. They were totally capable of understanding what the potty was for, but were also totally ok with going in their pants. So, they did.
Always we were defeated, consigned to spending in the neighborhood of $10 a day (give or take) on diapers and living a life where every time we went anywhere, I spent a great amount of time in the bathroom with my ten year olds and their diapers.
But two weeks ago, we went hardcore. Underpants were bought. And we put him in them. We showed him the Minions and said "Don't pee on the Minions!". His response was simply to shout the word minions back at us, that can be agree or disagree who knows?
Day one we had several accidents. However he also got up and went to the potty on his own, TWICE. I was overjoyed. SURELY WE WERE READY.
There are no books for how to potty train your ten year old who you can't have a conversation with. Regardless though, I think we're going to get it.