if a dragonmarked heir turned into a tiefling during the mourning, or gave birth to a teifling heir, what would the house do? Keep the heir for experimentation? Excoriate the family? Assassinate them? Accept them?It’s an unprecedented event, so it’s really a case of “What do you want them to do?” I could imagine Jorasco or Vadalis being fascinated and wanting to study the heir, but there’s no reason that couldn’t mainly involve reports and examinations between adventures.
— Keith Baker (@HellcowKeith) July 5, 2021
Tieflings are known to be an unusual mutation that’s generally caused by outside forces, so I wouldn’t see giving birth to a tiefling as being grounds for excoriating parents; it’s generally seen as more tied to location/planar influences than to bloodline. On the other hand, if it’s the story you want to experience, I could certainly imagine many enclaves treating a tiefling heir as essentially aberrant and expelling them.
— Keith Baker (@HellcowKeith) July 5, 2021