It makes The Crown look like Sesame Street. The bitter regal rivalries that led to war.

Stream Royal Cousins at War on BBC Select

Families are always complex. There are plots, scandals and betrayals. But when the family concerned rule the most powerful nations on the planet, these petty squabbles can lead to political turmoil, economic upheaval and even war.

Watch Royal Cousins at War and more acclaimed documentaries on BBC Select today. Restrictions apply*.

Watch Royal Cousins at War on BBC Select

At the start of the 20th century, three cousins ruled Britain, Russia and Germany. Their relationship and rivalries had a devastating impact on Europe then and now.

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