It seems to me that I've heard the Rafa and Malak story somewhere else. A person responsible for the death of the parents raised the children to manipulate them. I can't remember just where I saw that storyline. Perhaps Merlin's role in the Arthur legend?
And I know there are many stories of patricide in order to sieze power and infighting among brothers similar to the story of the Beoulve family. Again I'm having a tough time thinking of the specific stories.
Wasn't the English War of the Roses very similar to the Lion War? Where two different groups both thought that they were supporting the legitimate successor to the throne.

P.S. Hurry and vote to save Tactics in FF Survivor Round 10! It is so awesome that Tactics has made it to the final 4!!