Crown Prince Alexander has been married twice: 1972-1985 with Princess Maria da Gloria, Duchess of Segorbe, mother of their three sons. Crown Prince Alexander has been married to Katherine Clairy Batis since 1985, who has the title of Crown Princess Katherine.

His Royal Highness Crown Prince Alexander is the only son and heir to the last Yugoslav king Peter 2nd of Yugoslavia and Alexandra of Greece. When Yugoslavia, after the dissolution today, is understood as the state of Serbia, he more often uses the title as the crown prince of Serbia.

Crown Prince Alexanders oldest son Prince Petar renounced his succession rights on 28 APril 2022.