There is, in fact, a curse on the first-born of France.

Napoleon's son, the King of Rome, died in exile, an Austrian.

The Duc de Bordeaux, born eight years after him, never wore the crown, and died in exile, childless.

The Comte de Paris, born also at the Tuileries, was exiled when he was ten years old, and died in England.

All these, of one generation.