I've wasted so much time on this game, and I have all DLCs too and I am still learning new things. Had since release day too.
In my current game after knocking the Umayyad down to Grenada and Valencia, take everything else as Asturias/Leon (CM start) I decide with my current character to give my youngest son the Kingdom of Portugal, while my eldest will take the rest. Did this so I had a forever ally in future. Only problem, my youngest son goes and loses a claimant faction war while I was on Crusade....