The Wales family are usually at the family lunch, so I expect they were there this year as well.
That said, the children finished school on Friday, 16 Dec, and the lunch wasn't until Tuesday, 20 December. Depending on what else they had on, they may well have escaped to Anmer on 17 December.
I understand that they're living close enough to walk to Windsor Castle, so if the weather cooperated then they could have chosen to walk there. And let one or more members of the family burn off some energy.
Here's an aerial photo of Windsor Castle and Adelaide Cottage.
https://www.google.com/search?clien...ttage+and+windsor+castle#imgrc=XjJW5Qw_m-yeBM
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