Alle Kunst ist der Freude gewidmet

I know, but somehow I can find links sometimes and sometimes it makes sense and sometimes not. I don't think I can express this well, but my brain automatically comes up with ways how it can work and I try to incorporate some things that work.

Yeah, but what if non of her children survive? What would he do then? Just shrug and say "Oh my. My family has died out, someone else has to take over". Wouldn't that be a sign of a bad king?
That's what inheritance laws are for.

But how can he be an ideal king without heirs? (If we assume for a moment that Eirika´s kids can't inherit) His kingdom would be "lost" to him. How can he make sure someone worthy continues his work? How can a king with seemingly no forethought or ignores the possibility that something might go wrong be ideal? Of course, Ephraim could still believe that but his logic would be obviously faulty.

Yeah, they might. I just find it highly illogical in their situation and a waste of opportunities ;P