King Christian IX of Denmark with all of his six kids. 1903. From top (starting left): King George I of Greece, Queen Alexandra of Great Britain, Crown Prince Frederick (later Frederick VIII of Denmark), and Prince Valdemar of Denmark. From bottom (starting left): Tsarina Maria Feodorovna, King Christian IX, and Princess Thyra.
Germany. Kaiser Wilhelm II, ruler of Imperial Germany beginning in 1888. Oldest grandson of England's Queen Victoria, the Kaiser was a cousin to both King George V of England and Czar Nicholas II of Russia. As Germany's leader, Kaiser Wilhelm was obsessed with maintaining his popularity, and was therefore somewhat erratic in his decision making--torn between the advice of his ministers, his desire to be popular, and his fear of appearing weak-willed.
If Queen Victoria was the mother in law of Europe, King Christian of Denmark was the father in law. The six children of Christian IX and Queen Louise, photographed in 1882 at the occasion of their parents' Golden Jubilee. From the left: King George I of Greece, Empress Maria Feodorovna of Russia, Queen Alexandra of England, Crown Prince Frederik (VIII) of Denmark, Princess Thyra and Prince Valdemar.