I don't know if this has been reported or not, so I'll just mention it here. This is vanilla 1.2 game.

Used one of my Byzantine princesses to steal a Venetian general. Long story short, the Venetian guy becomes a faction heir, and once the emperor dies, he takes over the byzantine throne.

Now the bug: the family tree has disappeared. All that is displayed on the family scroll is the *first*(and long since dead) Venetian Doge and his long dead wife. That's it. Now, the oyal line is still there, I have the emperor and his heir, so functionally everything looks good, but nothing is listed on the family scroll.