Actually, it wasn't so much wedding daughters as step-whatnots. First degree cousins and the like.It was actually pretty hilarious when you run first time to the vanilla incest events in CK3 and when you notice that you are about to enter half-dozen wars simply because the rulers from those realms found out about few of the dozens of affairs and bastards that you have been having with their wives, daughters and lovers...
Simply because the combination of events and chaos that followed the inbred incompetents was just glorious to behold. It also took crapton of effort to maintain stable enough realm to actually support all your inbred family's kingdoms. With every character stat being the dump stat XD
Goodtimes. The only things saving everyone involved was family relationship bonus and alliances.
Neither. I just at one point ended up with a red-headed and green-eyed randomly generated starting minor ruler in Ireland, and the best match I could find for him was another green-eyed redhead, and a brilliant idea was born...I'm not much into incest
I wish I didn't lose that save, the state of Europe as a whole after 380 years was a sight to behold. Even had a foothold in the Levant.