It is good that you have made a clear stand. I hope that your meeting goes well with them.
"You are making a stand against Jehovah, that's something we cannot support"
A JW is so indoctrinated that they can not distinguish the difference between following God and following the Watchtower Society.This is the key to it all. I would make very clear and constantly bring it up, that you are not making a stand against Jehovah, you are making a stand against a cult.
In the last talk with my father I really highlighted that he believes everything from the Watchtower without question, because he thinks they are spirit directed. However, they are not, (as proven by elders being appointed whilst committing adultery, wrong teachings such as 1925, etc) and as soon as he accepts that he will find a lot of what he believes is wrong.
He retorted that everything he believes is from the Bible. So I made the following point. If it was from the Bible it would not constantly change. For instance if I was bleeding to death 20 years ago and asked him if a certain blood fraction (ie haemoglobin) could be used to save my life the answer would be "Definitely not, the Bible shows blood fractions are forbidden as offensive to Jehovah." If I ask the same question today the answer would be "Yes, that blood fraction is quite acceptable". The Bible has not changed, so he is not following the Bible but a group of men. He said the light is getting brighter. I said certainly not. It makes sense that if blood is wrong, so are fractions. However now, a JW can have a fraction, but can not donate blood, so where are the fractions coming from. The new stance is illogical, the light is less clear.
I just keep on the same tack, you do not follow Jehovah, you follow, without question a cult. All the cults think that they alone have truth. It is no different than a Mormon, and Mormons show how easy it is to be misled. In 2006 DNA was used to show that native Americans originated from Asian, disproving the claim in the book of Mormon that Native Americans came from the Middle East. This did not cause a huge exodus of Mormons. Shippes shows why not;
"This may look like the crushing blow to Mormonism from the outside," said Jan Shipps, a professor emeritus of religious studies at Indiana University-Purdue University Indianapolis, who has studied the church for 40 years. "But religion ultimately does not rest on scientific evidence, but on mystical experiences. There are different ways of looking at truth." http://www.latimes.com/news/local/la-me-mormon16feb16,0,5561316.story?coll=la-home-headlines (February 16 2006)
I don't know if that is the route you would like to take, as it is very harsh and may destroy your relationship even further. But I am happy that this is how I handled it as has changed the dynamic of my relationship as now my family do not look down on me with that arrogant Witness superiority, but now are the ones have to justify why they do what they do.