Hello, ApostolicJesus
I am, as my name implies, a third generation Jehovah's Witness going back to the very early 1900s.
My father as a young man, while favorable to the religion, was not baptized and married a non-JW. They had one son I will call D. The marriage ended and the boy was raised primarily with his mother.
Meanwhile, father gets baptized, becomes a JW zealot, and marries an equally zealous "pioneer sister". I was born 18 years after my half brother. There are no other siblings.
My Father abandoned D because he didn't want to become a JW so there was ZERO contact between my half brother and my family.
When I was in my 30's (in the '80s) I was an active JW but was disgusted that my father rejected his own son over a difference of religion. I reached out to D with a card, pictures of me and my family, and contact info. I heard nothing back.
A couple of years ago D's oldest son and I met online through a genealogy site. I asked if D had received my card from so many years ago. My nephew said he remembers D showing it to him (he's only 8 years younger than I) D had said he wants NOTHING to do with Anyone whose last name is C****!!
So my brother blamed me for the sins of our father and rejected a person who would dearly love him if he would let me.
The thing is I am VERY glad I tried. Now I sleep well not worrying "What if?" And I get to have a decent relationship with my nephew.
Nobody lies on their deathbed regretting reaching out in kindness. Just be prepared for whatever answer comes.