If I would just HEAR my JW's daughters voice ....I would say. I LOVE YOU ....& I am sorry for making you believe what I believed .!!!!
OM, let me tell you what happened yesterday. BTW I am still in (inactive but occasional mtg attender).
My Mom passed away last week. My df'd daughter showed up at the burial yesterday. We hadn't spoken in over 8 yrs. She had a lot of bitterness and resentment toward me. We embraced. I told her how happy I was to see her and that I loved her. It was WONDERFUL!!!!! We spent the whole afternoon together.
A well-intentioned JW friend had told me, "Don't spill your guts" (to my df'd daughter if I saw her in connection with the funeral). I COMPLETELY SPILLED MY GUTS (told her why I no longer believe what I taught her as TRUTH). It was FABULOUS. The main point is conveying UNCONDITIONAL LOVE. That will be worth more than a million dollars to your sibling.
Now, as you pointed out, if word of this (not just the contact but the content of the conversation) gets back (in my case to my ex-wife) there will be hell to pay. But I really don't care. I realize, in your case, it may affect your ability to work on your kids.
I hope, though, you can convey to your sibling your unconditional love.
Skeptic1914