For a family member to apply for a Schengen visa, I provided an official declaration of guarantee. Now I appear to be traveling myself when my family member enters Schengen, so I won't be able to fetch her from the airport. On Wikitravel I read:
Even if you possess a valid visa, actual entry may still be denied/refused if you are unable to satisfy the border officer's questions and/or requests to see documents.
Can a border officer require personal confirmation from an official declaration of guarantee and what happens if the declarer is not at the airport?