They have no idea, I have no idea. We are moving next year so going useful and minimal!
They like - science, animals, Harry Potter, Hunger games, Lord of the rings, board games, camping, swimming, climbing, cycling, piano/drums.
Ideas so far:-
nice fountain pens, ink, paper
Hogwarts Battle
Replacement pillow pets
?? Echo dot
Audio books
Highlighter pens
Dvds
Duvets.
Looking for a mixture of stocking fillers (generally all get similar things in different colours) and bigger presents (but not too physically big as will either have to move or chuck them within 6 months of Christmas). They generally get things rather than experiences (as we go out quite a bit anyway). Not massively materialistic so they may never come up with a list themselves. They don't need electronic stuff or bikes. Youngest still believes in the magic of Christmas!