The European Royals Message Board: Relationship

Not quite: Ludovika was a younger half-sister of King Ludwig I, the paternal grandfather of Ludwig II. That made the mad king and Sissi half-cousins, once removed. But if they shared the same biological father, they would have been half-siblings.

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But through her mother Ludovica, Sissi was a full cousin of King Ludwig II of Bavaria. So any resemblance could easily be explained.

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Have there ever been any allegations that he was the biological father of King Ludwig II of Bavaria? The reasons for my asking are that 1) he was a notorious adulterer; 2) the resemblance between his famous daughter Sisi and his equally famous kinsman ("Mad Ludwig") is striking.