Public Service Announcement: I went through 10 years of Christmas messages so you wouldn't have to...
In terms of photos, Harry and Meghan's wedding was featured in 2018, and then their engagement in 2018. Eugenie and Jack's wedding was also featured in 2018, but no engagement photo for them.
You then have to go back until 2008 to find another photo of Harry featured.
People who feature the most: George VI, Prince Phillip and Prince Charles. There's a bit of William and Kate but probably less than you''d expect - only 2 photos of the two of them, then individual ones of George and Charlotte in 2017, plus two of the Queen, Prince Charles, William and George (2013 and 2019). Then Anne and her whole family feature in 2011, somewhat surprisingly - maybe a significant birthday?
Queen Mary and George V in 2014, the 100th anniversary of the start of WWI.
No other children or grandchildren at all. I didn't look for the video footage, there's probably more there, but even I have my limits! Anyway, it's quite clear from this that it's the continuity of the monarchy that is the main focus.