You guys are ballsy to do these kind of crazy assassinations! What happened to you tyranny rating after you killed three of your sons' wives?
Oh, his spymaster was terrible and he and his wives were not so hot at Intrigue either. I had something like a 75% chance of killing them and only a 10% chance of getting caught after I sent my spymaster to his county to build a spy network. I think I failed a couple of times but wasn't detected, so it only cost me the 50 gold.