And things like that is why we had so many family massacres in medieval europe. Maybe asia also, but I am not sure, they have their own culture quirks.
@kwendy Nononono, you are right on that one. In Indonesia, a Kingdom name Majapahit, there's a war between family because of the throne. While, even in Japan, Oda Nobunaga kill his brother Oda Nobuhide to secure his place. Basically, all nobles, royal, kingdom will always have killing between family just for the position or the throne.