Gorgeous family photo, clearly dad said something funny to make the kids howl with laughter. Catherine looks stunning, even after major surgery.
Hopefully her recovery continues and she is having a good old laugh at all the conspiracy therory's, while they plan a nice holiday before returning to her public duties.
Edited, Maybe they all just fell around laughing when William said, 'hey darling, take off those ring's so we can give the conspiracy theorists something else to comment on, hide them in your pocket George.'