I read often that in Egyptian lines are the desendants of Sid Abouhom- El Deree are very bad temperd horses...
Also this is said in Paraskevas Book The Egyptian Alternative Volume II.
The same I heard and read from People in Germany who had known the stallion Farag, a Sid Abouhom grandson.
Also it is said Morafic was not easy to handle, also a Sid Abouhom Grandson. The same is said about Nil a Sid Abouhom son who was sold to Russia.
Also Lady Blunt said that the mare Rodana was bad tempered, the bad temperest of all her Mares.
But I never heard such bad temperd horses in Spanish Line's.