Will he notice if you move Christmas to 27th? With it being his first Christmas that he remembers even if you're opening other presents with family he won't know the routine of Santa coming on the same day! (Might not work depending on what you've got going on / if you see other children that might ask what he got)
Maybe save 1/2 the presents and do the same when he’s home? Just say Santa say your very special this year and he’s making 2 visits to our home 🥰 xxx