I trust that the descendants treat it with all due respect.
I think the significance of the effort to return it almost guarantees that. It will have historical importance even if they are not themselves
I'm not sure if this is a thing elsewhere but in Scotland family bibles were passed down to the eldest son/child and used to record marriages/births/deaths. I will inherit our bible which goes back to the 1700s.
It is rare, here, but, in some cases, it does happen.