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my question does not relate to UK. My sister lives in the other country from me and I am basically sponsoring the whole family, i.e. parents + sister. I was sponsoring their application for Schengen visa. For family members of EU citizens (which I am, I am a British citizen, which is part of the EU) the procedure of obtaining visa is simpler. Hence, I am trying to make sure that sister would qualify as a family member, "dependent ascendant" in particular. many thanks