If Only I Had Known . . .

My king, Joseph the Second abdicated the throne, and along with it made his son and heir, the head of their dynasty.  Erik held a great Court and did his best to gain yet another ally.  He tried and tried. They even became best friends, but the interaction for him to ask her to become allies, just wouldn't show up.  

The only thing that changed, only I didn't realize it up front, was when his father asked if they could stay with the now King for a few days.  Of course, the answer was yes.  Sadly, I now see that the new King is no longer the head of their dynasty, which made me think that's why he couldn't invite the other noble to join it. Only the head of the dynasty has that right. Face/palm.  

The former King will be leaving in a few days, but it leaves me wondering if his departure will put things back the way they were, or if his arrival had nothing to do with the switch? In looking at the Dynasty status, the former king is head of the dynasty. Oi.

If only I had known, I may not have been so quick to invite him to stay!

What are things you wish you had known in advance before you proceeded along a certain path in your game? Please share.