Educate yourself. This is paramount.
Know what you are talking about first. Get your facts straight. Humble yourself to the truth and let it do the job for you.
Do not allow yourself to think you will accomplish this on your own. If you fail at this first thing, then call a good divorce lawyer.
As you come to understand clearer the truth and the facts, then it will become clear to you what to do.
If you have a family study, do not miss it. But know the whole truth thoroughly and when you sit down to study, this is your opportunity.
If you don't have a formal study, I think most JWs do not study in actuality, but regardless, any opportunity to discuss the material at hand is an opportunity to insert some truth into 'the tr00th'.
As some have said, little things... Never a barrage. Restraint. Patience. Thick skin and prayer.
This weeks Kingdom Book study was a golden opportunity. Learn what the material is actually saying. Think of different ways to express it, and short.
For example. Ask your wife, who are the "close associates" the article speaks of that were part of CT Russell's little circle. Research and know who the men in the article mentioned were. Know what the article says, and more importantly know what it doesn't say, that will be understood by dub readers, to have been said. Articles many times are intentionally written and designed to infer something untrue so as to benefit Watchtower.
Does wife know that the article is teaching that CT Russell was the fulfillment of prophecy, specifically the one that refers to the coming of John the Baptist (Baptizer in JW lingo)
Does wife know that CT Russell and George Storrs had nothing to do with one another. Storrs had a magazine called "Bible Examiner" through which Russell learned the truth about the Trinity and Hellfire. Russell was 27 when Storrs died at 83yrs in 1879 and when the "Bible Examiner" didn't have its owner, Russell started The Watchtower magazine.
This is a smattering of he facts. Use them. But use them cautiously, do not shove a clump of food down the drain, it'll plug.