They seem like it, don't they? But no, there are no recent relations between the families - I won't leave out the possibility of some far distant interbreeding - think of it as convergent evolution of sorts, where those who have reached a lofty position tend to have similar attitudes. Generally speaking, those who practice Witchcraft tend to be looked down on in the Association due to the limitations and how it is unlikely to reach the origin - and this is an entire society that practices a witchcraft derivative.