Rearranging the letters of 'Windsors and Middletons' gives:
Modern inlaws didn't doss.
(by Mike Mesterton-Gibbons by hand) (2011) (pending approval)
Other related anagrams without their own page:
"Prince William and Kate Middleton" -> "Diana killed in Merc: admit new plot." (by Dave Payn by hand) (2010) (pending approval)
"Kate Middleton Pregnant Again?" -> "Potential great and named king?!" (by Aronas Pinchas ) (2014) (pending approval)
"The Royal Couple: Prince William and Kate Middleton" -> "Two, tumidly married, like place in the London palace." (by Aronas Pinchas ) (2011) (pending approval)