I've just started my own Rival Dynasties Challenge and I read the first post of instructions quite a few times. So, I'm pretty sure that I've been following the rules; however, I ran into a slight hiccup.
When my retail founder gave birth, she had twins (1 boy/1 girl). So, I've reread the first posts of instructions and unless I'm missing something, I only could find twins addressed in regards to rotational play. However, I'm still in the first week of playing w/o having switching households yet. Which twin is the heir?