So toward the end my father-in-law said that we can keep in touch "as a
family." Not sure if any of you might be able to explain that? He also
said to email any questions that we have and he can give us answers. I
told him thank you but no. He's far too old to destroy his faith like
that and I told him that.
I'm sorry to hear about losing your children. My condolences.
I am glad that you remained in charge of your decision in spite of them only having "blinded by Satan" to say to you. That is not simple thing to say.
Although I do not know the entire background story, though, I wonder why the drastic decision of cutting ties in spite of them wanting to leave the door open "as family". I could guess that you don't want to hear their nonsense about seeing your children in paradise on Earth, but I wonder if there's more that makes you not wanting them in your life.
Don't get me wrong, I too walked away from my entire family and I'm very happy that they aren't part of my life, but in my case there's more than the Jehovah crap that made me step away from my family.
I always lean towards advocating for maintaining a family relationship (a healthy one, of course) when/if possible. So my guess is that it may be his way of wanting to keep the door open and maintain some sort of relationship.
In my case, some of my JW family members want me in their lives. I decided not to because they one an unilateral relationship. They expect me not to say anything about me and my life that they don't want to hear, yet they still want me in their lives like that. It is an effort to stay in touch and feel good that they have a relationship with me, but it's not a loving, respectful, not even real relationship.
My guess is that in their own way they are trying to cope with losing you.