What is tough is that we have been close for past 15 years. I call my Mom weekly and speak with my Dad a couple times per month. Visit them at least once per month. Took them out to dinner in October and then brought food over and had dinner with them early December.
I have to ask. Everything you said above is what you did for them. I noticed this because this situation just happened in a group I run and we talked about these things. Do they call you regularly? Do they visit you? Do they take you out to dinner or bring food over? Or is this purely a one way street?
I ask because the reality is that many ex-JWs have very narcissistic parents that they fawn over and are codependent with, doing anything they can for them and calling it love when really it's servitude in the hopes of one day being good enough for their parents' love, much like the way people serve Jehovah hoping to one day be good enough. People sometimes say they love their parents when in reality they seek love, they don't have it.
If nothing else, your parents just showed how shallow their love really was, and you had to hide your true selves all of this time. So although you had good times with them, there were always conditions to it all, they've now added another.
I'm sorry this happened. It's typical. JWs are typically incapable of real love. It's about control. Guess who gets to decide what "necessary family business" is? They do, not you. I've spoken to people that were homeless and that didn't qualify. They want you to fail. They want you to hurt. They want that to make you come back because once again, it's about control, not love. Control is the opposite of love.
If you get an opportunity at some point to show them what "unconditional love" is, my assertion (from my own experience) is that they won't see it and won't care so you would only be doing it for yourself while in essence not effectively loving yourself, allowing yourself to be their doormat once again. That's not loving to them, as they are enabled to act poorly with no consequences, and you hurt yourself once again not being authentic and spending life looking more codependent and obsessed with their feelings than caring about your own.
From what I see these relationships get truly twisted, including the feelings around them. That's my view, yours may differ.
In the end what they did was awful and cold and typical of Jehovah's Witnesses, destroying another family. That's what they do, and honestly for many the family was effectively destroyed the moment that virus came into their lives because something was always in between their relationship. I'm so sorry. So much unnecessary pain and suffering because a cult stole the minds and hearts of people and their base humanity has been stripped. Hugs to you and yours.