Congac,
The Society uses "Dual fulfillments" like herion. This could be helpful with your hubby. You should gather a list of "dual fulfillments" and discuss go over them using only the Bible. After a while you begin to see that the notion of dual fulfillments simply gives the Society license to teach whatever they want and contend that it originally came from the Bible.
Here is a classic example: The Tree Dream
Read the Scriptures in Daniel 4 that the Society uses to come up with 1914. It has to do with Nebuchadnezzars "Tree Dream". Daniel clearly says that this dream applied to Nebuchadnezzar and had its fulfillment then. Daniel defined every aspect of the dream. The Society however claims it has a second, hidden fulfillment that calculates to 1914 with all sorts of secret meanings. Shockingly no other bible writer after Daniel hints at such a dual meaning. Not the prophets, nor Jesus, or the Apostles. Doing a little more research you will find that the whole "Tree Dream" calculation was first postulated by Adventists writers and borrowed by Charles Russell - to the point where some accuse him of plagerism.
Read the scriptures by themselves and see if you find hints of secret meanings.