@CurlyWurlyTwirly
I've wondered whether Camilla's children will attend at that point.
They are basically nothing to the Queen but on her death they'll become the King's Stepchildren
I suppose the others will continue to attend for William, Harry, Zara, Bea and Eug they are in their 30s and have done this all their lives, they may want a change, but never have Christmas again where you've always had it - doubtful