I think it has to do with succession laws. The grandfather of the crown prince had full sisters yet it was his older half-brother that was his heir until his son was born. It seems that succession rights only transmit to and through the male line at present. With the youngest of the men behind the crown prince being born in 1966 i assume things will change unless little Geraldine gets a brother.

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The "unofficial royal news" site has the announcement of the birth of Princess Geraldine. However, there is an indication that the heir to the throne of Albania following Leka II is a distant cousin of the prince. Was this the situation prior to little Geraldine's birth, perhaps?