Hello cjones!
I'm so sorry about your husband. It's a heartbreaking situation. Educating yourself about the WTS is one of the best things you can do. Then, if you could try to very gently & respectfully plant seeds of doubt in his mind about the organization.
May I suggest Rev. Wilbur Lingle's book: Approaching Jehovah's Witnesses In Love: How To Witness Effectively Without Arguing. This book has been a God-send for me......as I'm trying to help my son see that the WTS organization is NOT what it claims to be. Rev Lingle has come up with some excellent questions to ask our JW loved ones & friends. Questions that will make them think for themselves......instead of just swallowing whole what the WTS feeds them.
Blessings to you,
Lavendar