The Beckhams were invited to both Will's and Harry's weddings and they did attend. Simple courtesy would be to invite the Cambs & Ssexes as well. Whether they'll go is another thing, but I suspect that both Will & Harry would want to go, as it is primarily their being fans of Dave and happily working with Dave on projects that had the Beckhams invited to stuff in the first place.
If I am not entirely mistaken or misremembering, Will was in favour of knighting David (many years ago, before the leaked emails).
If I am not entirely mistaken or misremembering, Will was in favour of knighting David (many years ago, before the leaked emails).