I have to agree with cameo-D.
Look, you know that there is a "...a sickeningly self righteous holier than thou JW elder."
If you actually believe a holier than thou JW Elder is going to let any unmarried, young people sleep in his home, you are delusional. Seriously. Sorry to be blunt, but you need to take a step back and look at it from *his* viewpoint.
He has his position to think about. His reputation. As a leader of the pack of Dubs, he has to uphold all the rules and regulations he imposes upon others. If he lets his step-grand-daughter and her boyfriend come by and stay, he will have to bend the rules for anyone in the Cong who finds out he did it--and they will find out. They always do. He will be a hypocrite.
He won't risk it. His position as an Elder is too important. You have to realize that after being on this board.
As for them sharing a bed and not having sex--you are also delusional. Hopefully they are using protection. At least put some condoms somewhere where they can find them. For their sake and their future. Having kids so young is tough. Some close relatives did and they never finished school etc.
BTW, the sleeping arrangements of people in someone else's home comes up in Dear Abby to Ann Landers to every advice columnist in any US paper. Not having unmarried people sleep together is not a JW thing, nor a religious thing. The people could be 19 or 60. People who have guests in their home just don't want to know that people are having sex in their beds, apparently. Unmarried.
Why, I don't know. However, Motel/Hotel is always an option.
Cutting people out of your life, just over this seems extreme and over the top. Especially if the JW Elder is talking to you and them. I would think long and hard about that. Throwing people away over a *morality* issue, that you claim doesn't exist, should be a last resort.