Your best bet is to not engage him in any conversation about the lie.
He may do a 180 on you one day and rat you out thinking he is saving you from da debbil.
As for your wife, it's best to live and let live. I wouldn't bring up anything about the lie until she does.
I give it 5 years and she will be be doubting to the point she will ask you to tell her what you know about the cult.
All those blue JW.ORG placards pasted on the brick marquee beside "Kingdom hall of Jehovah's Witnesses" at every kingdom hall with 15 miles of me (4) has every nonJW asking me WTF?
It won;t be long before JW's start waking up and asking themselves what's the difference between a cross on a church and JW.ORG on the kingdom hall marquee.