I think they should go to the coronation.
Since it's being repeated that H hates his family, I will also repeat that he does not. He hates the workers who are calling the shots and influencing his family. Get rid of the bigoted lot, not H and his family.
Now, I understand if H&M do not go for their own mh. I hope they don't get bullied out for the sake of historical record. As HMQE demonstrated, you can only get a few coronations - maybe one in a lifetime. So it must go down in history that H and his mixed raced family were at that coronation. They must not be scrubbed out.
H&M did not cause any hurt, the courtiers and their media cronies did.
There was a time when Sir Christopher Geidt was a courtier. Don't know much about him, but by all accounts he was said to take care of the family and staff welfare. Going around chatting to everyone so he knew the staff members by name and what is going on in their lives. Charles and Camilla kicked him out, replaced him with one of their attack dogs. William was reportedly angry at this. Later, HMQE supposedly called him back when she heard about all the negative headlines about MM - though I believe there were some frustrations about him being stonewalled by the new aggressive staff apparently. Several other people took care of H when growing up and they are mentioned in the book, though I did not hear about Sir Christopher, as I would have liked to hear more.
So, yeah .
H&M should come and not let the 'help' bully them out of history books. They already bullied them out of the institution.