Help! What should I get my Brother and Sister in law for Christmas?

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My Brother and Sister in law recently moved into a small apartment. With Christmas coming we are trying to come up with gift ideas for them. They are tight on space so we don't want to add more to their clutter. For birthdays this year we got them gift certificates but it seems so impersonal. What small things can we get them that will be meaningful but don't take up a lot of space?