My character lived for 80 odd years. I got busy with crusades and defending my new territories and allies territories from the infidels and stopped paying as much attention to the homefront as I probably should have. It wasn't until he died that I realized his grandson, Charles - my new character, had married a first cousin while the AI was in control. The AI has also seen fit to have Charles' heir, David marry a first cousin as well. Their first two children have been either slow or clubfooted.
Is there anything I can do to force the AI to stop the first cousin marriages other than not granting my heir any titles?