Does anyone know the type of genetic blood disease of the Royal Wilhelm family? References needed?

Answer 1

Haemophilia (also known as hemophilia)

It is the bloods inability to form blood clots and even the slightest injury can result in severe bleeding because the the genetic code for it is either missing or diminished.

It is passed on to males through their mothers, and the mother is only a carriers.

According to the following website
http://users.skynet.be/sky60754/genealogiealom/genealalgwete.htm:

"Royal hemophilia so far has afflicted nine male descendants of Queen Victoria, including the tsarevitch Alexis Romanov and an uncle of the present King of Spain, the Prince of the Asturias, who hemorrhaged to death after a car accident in 1938.

The original mutation of the gene, which was inherited by one of Queen Victoria's four sons and two of her four daughters, is believed to have occured in the X chromosome of her father, Edward, Duke of Kent. When Victoria was born in 1819, Prince Edward was 52, and the germ cells of older men are more prone to some types of mutation.

The execution of tsar Nicholas and his family and the untimely death of two afflicted Prussian princes have eliminated the mutant gene from Victoria's Hesse line, but it may still be carried recessively by some of her English and Spanish female descendants"