Queen Victoria had four sons
Albert Edward
Arthur
Alfred
Leopold
The reason why Albert Edward, Arthur and Alfred did not display
hemophilia is because they did not have it. Hemophilia is a sex
linked gene. Leopold got hemophilia because Victoria carried the
gene. She had one healthy X chromosome and an X that had the gene
for hemophilia. Leopold got the X with hemophilia and the other
boys got the healthy X chromosome