fossball says:
... Would Norbert be welcome ...
I assume anyone the heroes say is part of their group would be 'welcome' ... enough.
fossball says:
... he could sleep in the fields tonight ...
If you, as a player, want that to happen we can say they only want to offer 'beds' to the official heroes. But that does separate the party for a longish time so we will need to work to fill both story-paths equally (which is fine (until the end when timing can get messy:)).
fossball says:
... it would be weird for him to sleep with Christian ...
How so? Is there history between these families? Does he know who you are?
Again, it is up to you if there is, and whether that means you have to sleep elsewhere, or whether that adds drama to your stay at Christian's.
fossball says:
... And where would Theo and friends go? ...
If you have to sleep elsewhere then that may be interesting and we will address that, else they will go with the group.