Prince Karl Alfred of Liechtenstein (Karl Alfred Maria Johannes Baptista Heinrich Aloys Georg Hartmann Ignatius; 16 August 1910 17 November 1985) was a Liechtensteiner prince and brother of Franz Joseph II. He was the third child and second son of Prince Aloys of Liechtenstein and Archduchess Elisabeth Amalie of Austria.
Does this next sentence follow, given the preceding text?
Prince Karl Alfred had two siblings.

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I. Yes
II. It's impossible to say
III. No
I.