Yes, it was passed by Queen Victoria to her daughter who married the Russian and passed it to Alexei. It goes through the female line.
Queen Victoria had a son who was disabled also.
I have lots of royalty in my ancestry and one other trait is long fingers. All my family have long fingers. I believe it is from the Scottish side and not the Norman side.
Another inherited malformation is..Dupuytren’s contracture, all my family has it.
Plantagenet’s had it, as did a lot of the Stuarts.
Of course it is not uncommon in Northern European ancestry.
Yes. Imagine if the czars children had lived and had children.