NM will be in his early 60's at the earliest when released. His child(ren) will be grown up and presumably won't have had anything to do with him. His mum, if still around will be in her 80's, as will DG. I think, when looking at the sentence in that respect, it makes it a bit easier to bear. He is loosing all the best years of his life, and his family will have all moved on. He won't have anything to come out to. He'll have no friends, no connections and will probably end up on benefits for the rest of his life, living in a hostel or similar. Becky's brother and other young relatives will still be alive and around to ensure the public know who he is, and what he did. He won't have any peace. His life is as good as over really. Its not as bad as what Becky suffered, but lets face it, he won't really have much to look forward to on release - if, indeed, he is released.
I'm more worried by SH's sentence. She will be released whilst her child still has some growing up to do. I just hope there are legal things in place to stop any contact.