Julieca I can’t really believe that you genuinely believe this, but if you do want to come up with your own narrative it helps to make sure that it survives consideration of the facts.
If you actually look at the dignitaries box at Wembley, unlike the general admission areas, they have big seats, quite a long way apart from each other (you can google for pictures of people sitting in it at the final, if you care).
The Cambridges sat with George between them, and stayed that way for most of the match. Taking up three seats in a line automatically meant they were quite some way apart, so that is “how they looked while watching the match”. If you look for example at the footage of William celebrating England’s goal, you can see they are all sitting down, only to leap to their feet cheering when the goal was scored. Each of them leant down in turn to hug and celebrate with their son, who was between them.
Towards the end of the match when it got very tense, they stood up and moved closer together. You can see tv footage of this, by the way, and this was very much a candid shot, not a posed photo.